What was the most significant event on April 19 during the U.S. Civil War?

IMHO opinion the two most significant events on April 19 bookend the Civil War.
1. On April 19, 1861 the Massachusetts 8th Infantry was attacked by a secessionist mob in Baltimore, Maryland as the troops were bound for Washington, D.C. This has been recorded as the Pratt Street riot. Slavery supporters existed in Maryland and other northern states Marylanders’ fought as Federal Soldiers and others as CSA soldiers
2. On April 19, 1865 the Funeral services for President Abraham Lincoln served as a closure in a sense to the assassination and yet many grieved his death in north primarily and some in the south.

Pictures
1. 1861 April 19 Baltimore, Maryland secessionist rioters attack a train of Massachusetts Volunteer soldiers on their way to duty in Washington, D.C
2. Period engraving of the 6th Massachusetts coming under attack from the mob during the Pratt Street riot in Baltimore Maryland – April 19, 1861
3. USS Miami was a side-wheel gunboat commissioned at the Philadelphia Navy Yard on November 16, 1861. In 1864, On April 19, 1864, the CSS Albemarle sailed down the Roanoke to join battle with the Union fleet. In an attempt to trap the ironclad, naval Commodore Charles W. Flusser ordered chains hung between the two Union vessels. However, the Albemarle recognized the Union ruse, and rammed the Southfield. After Flusser’s death, the captain of the Miami cut her chains and ran for the Albemarle Sound. Severely damaged during the battle, the Miami spent time in dry-dock before resuming patrols on the James River. Decommissioned after the war, the Miami was sold as surplus in August 1865.
4. 'Kate Cumming' Confederate army nurse Army of Tennessee, 1862
5. 1865, April 19 Funeral Card for President Abraham Lincoln [ February 12, 1809 - April 15, 1865] with 'malice toward none and charity to all.
6. President Andrew Johnson - official photograph


1861: Since Maryland like its neighbors Delaware and Virginia was in favor of slavery it is not surprising that mobs attacked Federal soldiers coming to defend the nation’s capital. I was interested that Baltimore, Maryland had earned the nickname Mobtown by 1837.
I was reminded of events the summer of 2015 which garnered national attention in Baltimore as riots over alleged police brutality gripped parts of the city.
During the course of the Civil War, more than 50,000 Marylanders fought for the Union while about 22,000 volunteered for the Confederacy.
1861: Virginia forces take control of Harpers Ferry, Virginia
1861: Federal marshals seize records of telegraphs sent from major northern cities, leading to the arrest of southern sympathizers.
1862: Kate Cumming, a nurse for the Army of Tennessee at Corinth: I was shocked at what the men have told me about some dead Federals that they saw on the battle-field. They say that on the bands of their hats was written, "Hell or Corinth;" meaning, that they were determined to reach one of the places. Heaven help the poor wretches who could degrade themselves thus. I cannot but pity them, and pray that God will turn the hearts of their living comrades.
1863: Grierson’s Raid: Early this morning, Grierson’s columns ride into the town of Pontotoc, surprising the town’s garrison and routing it. The stores and supplies of the town fall into their hands. So far, the Union raiders have pushed over 70 miles into Mississippi without any serious opposition.
Pictures; 1861 Considered the first blood shed of the Civil War on April 19th 1861 the Baltimore Riot; 1864 USS Miami
Since RallyPoint truncates survey selection text I am posting events that were not included and then the full text of each survey choice below:
A. A Friday, April 19, 1861: the first blood of the American Civil War is shed when a secessionist mob in Baltimore attacks Massachusetts troops bound for Washington, D.C. Four soldiers and 12 rioters were killed.
On April 15, President Abraham Lincoln issued a public proclamation calling for 75,000 volunteer soldiers to help put down the Southern “insurrection.” Northern states responded enthusiastically to the call, and within days the 6th Massachusetts Regiment was en route to Washington. On April 19, the troops arrived in Baltimore, Maryland, by train, disembarked, and boarded horse-drawn cars that were to take them across the city to where the rail line picked up again. Secessionist sympathy was strong in Maryland, a border state where slavery was legal, and an angry mob of secessionists gathered to confront the Yankee troops.
Hoping to prevent the regiment from reaching the railroad station, and thus Washington, the mob blocked the carriages, and the troops were forced to continue on foot. The mob followed close behind and then, joined by other rioters, surrounded the regiment. Jeering turned to brick and stone throwing, and several federal troops responded by firing into the crowd. In the ensuing mayhem, the troops fought their way to the train station, taking and inflicting more casualties. At the terminal, the infantrymen were aided by Baltimore police, who held the crowd back and allowed them to board their train and escape. Much of their equipment was left behind. Four soldiers and 12 rioters were killed in what is generally regarded as the first bloodshed of the Civil War.
Maryland officials demanded that no more federal troops be sent through the state, and secessionists destroyed rail bridges and telegraph lines to Washington to hinder the federal war effort. In May, Union troops occupied Baltimore, and martial law was declared. The federal occupation of Baltimore, and of other strategic points in Maryland, continued throughout the war. Because western Marylanders and workingmen supported the Union, and because federal authorities often jailed secessionist politicians, Maryland never voted for secession. Slavery was abolished in Maryland in 1864, the year before the Civil War’s end. Eventually, more than 50,000 Marylanders fought for the Union while about 22,000 volunteered for the Confederacy.
B. Sunday, April 19, 1863: Joint Army and Navy operation takes Fort Huger, Virginia, thus reopening the river to Union shipping. The naval part was commanded by Lt. R.H. Lamson and the ground forces were commanded by Brig. Gen. George W. Getty. They l landed on Hill’s Point at the confluence of the forks of the Nansemond River at about 6:00 P.M. They established a foothold and brought their troops and several guns ashore. There was not any opposition to the landing. Union infantry force landed on Hill’s Point at the confluence of the forks of the Nansemond River. This amphibious force assaulted Fort Huger, Virginia from the rear, quickly capturing its garrison, thus reopening the river to Union shipping.
Once Fort Huger's garrison saw that they were surrounded, the fort commander surrendered the fort to the Federals
C. Tuesday, April 19, 1864: Roanoke River, North Carolina: Having been constructed at a makeshift shipyard in a cornfield, the CSS Albemarle, a new ironclad ram, is launched, steams down the Roanoke River, and carefully negotiates the obstructions in the river placed by the Yankees. She is commanded by Capt. James W. Cooke. The USS Miami and USS Southfield are lashed together to block access to the river, but the Albemarle rams the Southfield, and gets her ram prow stuck in the Southfield’s hull as it sinks.
The Albemarle breaks free, however, as the Miami fires a shell which bounces off the Albemarle’s armor and lands back on the Miami and explodes, causing damage and casualties---including killing Captain Flusser, the Miami’s skipper. The USS Miami escapes downriver. The Albemarle follows, dropping down below Plymouth, cutting off the Union garrison from its line of supply.
The new Rebel ironclad carries two large-bore Brooke Rifles, cannons with good range. Each gun pivots and can fire in a 180-degree radius, with the choice to fire out of any of three gunports each
D. Wednesday, April 19, 1865: FUNERAL SERVICES FOR PRESIDENT LINCOLN. President Andrew Johnson, the Cabinet, Supreme Court justices, members of Congress, military figures and the diplomatic corps in full “court dress” filed into the East Room of the White House. Robert Todd Lincoln represented the family as Mrs. Lincoln and Tad remained sequestered. At the head of the catafalque stood Lieutenant General Ulysses Grant alone. After the brief service, the funeral carriage, escorted by cavalry, infantry, artillery, Marines, their banners draped, and the bands playing sorrowful dirges, carried Lincoln’s body past throngs of people to the rotunda of the Capitol. Now it was the public’s turn, and, until the next evening, they filed past the catafalque in steady streams.
1. Friday, April 19, 1861: Surprising most people, Lincoln calls for a blockade of Southern ports, a major element of Winfield Scott's Anaconda Plan
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2. Friday, April 19, 1861: Virginia forces take control of Harpers Ferry, Virginia
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3. Friday, April 19, 1861: Federal marshals seize records of telegraphs sent from major northern cities, leading to the arrest of southern sympathizers.
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4. Friday, April 19, 1861 --- Lincoln orders a blockade of the Southern Coast.
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5. Friday, April 19, 1861: A+ George Templeton Strong, in his journal, writes: "There has been a serious disturbance in Baltimore. Regiments from Pennsylvania or Massachusetts assailed by a mob that was repulsed by shot and steel. . . . It’s a notable coincidence that the first blood in this great struggle is drawn by Massachusetts men on the anniversary of Lexington. This is a continuation of the war that Lexington opene–a war of democracy against oligarchy. God defend the Right, and confound all traitors. Amen and amen."
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6. Saturday, April 19, 1862: The Joint Committee on Flag and Seal backs the flag proposed earlier by Barnwell Rhett. The Confederate House eventually tables the design.
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7. April 19, 1862 --- Gen. Beauregard has gathered more troops and concentrated them at Corinth, Mississippi, expecting the victorious Federals to come down the road and capture this most vital of railroad junctions. Including the 14,000 troops that Maj. Gen. Earl Van Dorn has brought from Arkansas, the Southern force at Corinth numbers close to 50,000. Meanwhile, Gen. Henry W. Halleck arrives at Pittsburg Landing from St. Louis to personally take command of the combined field armies of Grant, Buell, and Pope, with the intention of mounted a push toward Corinth.
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8. April 19, 1862 --- In the Shenandoah Valley, Stonewall Jackson is at Harrisonburg and is mindful of the approach of Gen. Banks’ Federal army several miles north at New Market. Jackson begins his march southeast, toward the narrow Luray Valley, squeezed between Massanutten Mountain and the Blue Ridge. He sends cavalry to burn bridges in order to prevent the Yankees from following.
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9. April 19, 1862 --- Kate Cumming, a nurse for the Army of Tennessee at Corinth, records this incident in her journal about the poor breeding of the Northern men: I was shocked at what the men have told me about some dead Federals that they saw on the battle-field. They say that on the bands of their hats was written, "Hell or Corinth;" meaning, that they were determined to reach one of the places. Heaven help the poor wretches who could degrade themselves thus. I cannot but pity them, and pray that God will turn the hearts of their living comrades. Can such a people expect to prosper? Are they really mad enough to think that they can conquer us—a people who shudder at such blasphemy; who, as a nation, have put our trust in the God of battles, and whose sense of the magnanimous would make us scorn to use such language?
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10. Sunday, April 19, 1863 --- Pres. Abraham Lincoln takes a steamer to Aquia Creek, Virginia, to meet with Gen. Hooker and discuss war plans. Gen. Stoneman’s cavalry is still stuck at the crossings of the Rappahannock, and Hooker’s plans on hold, at the moment.
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11. Sunday, April 19, 1863 --- Grierson’s Raid: Early this morning, Grierson’s columns ride into the town of Pontotoc, surprising the town’s garrison and routing it. The stores and supplies of the town fall into their hands. So far, the Union raiders have pushed over 70 miles into Mississippi without any serious opposition.
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12. Sunday, April 19, 1863 --- Gen. John McClernand, at New Carthage, Louisiana, sends an urgent message to Gen. Grant for a dozen river transports, with which he promises an end to the war in the Gulf States, by enabling him to capture Grand Gulf, on the Mississippi shore of the river: GENERAL: My present movement, if properly sustained, ought, and I believe will, eventuate in the extinguishment of the rebellion in the Gulf States, and limit it in the East.
Please give me a dozen good transport. They are necessary to enable me to move my forces rapidly, and to strike the enemy before he can fortify. . . . Without them, delay and approaching hot weather may ensue to jeopardize everything; without them, Grand Gulf may become another Vicksburg or Port Hudson. The loss of a few transports in running the blockade are not worthy to count anything in the opposing scale.
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13. Sunday, April 19, 1863 --- George Templeton Strong writes in his journal about England and its sympathies: We drift fast toward war with England, but I think we shall not reach that point. The shop-keepers who own England want to do us all the harm they can and to give all possible aid and comfort to out slave-breeding and woman-flogging adversary, for England has degenerated into a trader, manufacturer, and banker. . . . It’s fearful to think that the sympathies of England---the England of Shakespeare and Hooker, Cowper, Milton, Somers, Erskine, and others . . . are guided more by mere considerations of profit and loss.
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14. Sunday, April 19, 1863: The Nebraska Territory enabling act, the first step in statehood, is signed into law.
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15. Wednesday, April 19, 1865: Federal Major General John Pope, commanding the Federal Military Division of the Missouri in St. Louis wrote to Confederate Lieutenant General E. Kirby Smith, commander of the Confederate Trans-Mississippi Department, suggesting that the forces west of the Mississippi River surrender on the same terms as those which Lieutenant General Grant gave to General Robert E. Lee ten days prior.
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16. Wednesday, April 19, 1865: Confederate President Jefferson Davis and his entourage arrived at Charlotte, North Carolina. It was here that Davis first learned of Lincoln’s assassination.
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A Friday, April 19, 1861: the first blood of the American Civil War is shed when a secessionist mob in Baltimore attacks Massachusetts troops bound for Washington, D.C. Four soldiers and 12 rioters were killed.
On April 15, President Abraham Lincoln issued a public proclamation calling for 75,000 volunteer soldiers to help put down the Southern “insurrection.” Northern states responded enthusiastically to the call, and within days the 6th Massachusetts Regiment was en route to Washington. On April 19, the troops arrived in Baltimore, Maryland, by train, disembarked, and boarded horse-drawn cars that were to take them across the city to where the rail line picked up again. Secessionist sympathy was strong in Maryland, a border state where slavery was legal, and an angry mob of secessionists gathered to confront the Yankee troops.
Hoping to prevent the regiment from reaching the railroad station, and thus Washington, the mob blocked the carriages, and the troops were forced to continue on foot. The mob followed close behind and then, joined by other rioters, surrounded the regiment. Jeering turned to brick and stone throwing, and several federal troops responded by firing into the crowd. In the ensuing mayhem, the troops fought their way to the train station, taking and inflicting more casualties. At the terminal, the infantrymen were aided by Baltimore police, who held the crowd back and allowed them to board their train and escape. Much of their equipment was left behind. Four soldiers and 12 rioters were killed in what is generally regarded as the first bloodshed of the Civil War.
Maryland officials demanded that no more federal troops be sent through the state, and secessionists destroyed rail bridges and telegraph lines to Washington to hinder the federal war effort. In May, Union troops occupied Baltimore, and martial law was declared. The federal occupation of Baltimore, and of other strategic points in Maryland, continued throughout the war. Because western Marylanders and workingmen supported the Union, and because federal authorities often jailed secessionist politicians, Maryland never voted for secession. Slavery was abolished in Maryland in 1864, the year before the Civil War’s end. Eventually, more than 50,000 Marylanders fought for the Union while about 22,000 volunteered for the Confederacy.
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A+ Friday, April 19, 1861: Southern sympathizers in Baltimore, Maryland cut telegraph lines and bridges to Washington, D. C. While passing through the city, the 6th Massachusetts Regiment is attacked. They open fire on a crowd. When the dust settles, three soldiers and one civilian were dead, the first casualties during fighting in the Civil War.
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A++ Friday, April 19, 1861: The 6th Massachusetts Infantry, a militia unit on its way to protect Washington, is attacked by an angry mob in the streets of Baltimore while changing trains. Shots are fired at the troops, who shoot back. Killed are [12] civilians and 4 soldiers, with many dozens badly wounded. The Baltimore Massacre raises a firestorm of outrage in the North, and sympathy in the South. James Randall writes the famous song Maryland, My Maryland! which becomes a favorite Confederate rally song, even though Maryland does not eventually secede. Rioting continues in Baltimore (which long before had acquired the nickname "Mobtown") for several more days.
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B Sunday, April 19, 1863: Fort Huger, Virginia - On April 19, the Union force approached Fort Huger. The naval part was commanded by Lt. R.H. Lamson and the ground forces were commanded by Brig. Gen. George W. Getty. They landed at about 6:00 P.M. They established a foothold and brought their troops and several guns ashore. There was not any opposition to the landing. Once Fort Huger's garrison saw that they were surrounded, the fort commander surrendered the fort to the Federals.
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B+ Sunday, April 19, 1863: A Union infantry force landed on Hill’s Point at the confluence of the forks of the Nansemond River. This amphibious force assaulted Fort Huger from the rear, quickly capturing its garrison, thus reopening the river to Union shipping.
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C Tuesday, April 19, 1864: Roanoke River, North Carolina: Having been constructed at a makeshift shipyard in a cornfield, the CSS Albemarle, a new ironclad ram, is launched, steams down the Roanoke River, and carefully negotiates the obstructions in the river placed by the Yankees. She is commanded by Capt. James W. Cooke. The USS Miami and USS Southfield are lashed together to block access to the river, but the Albemarle rams the Southfield, and gets her ram prow stuck in the Southfield’s hull as it sinks.
The Albemarle breaks free, however, as the Miami fires a shell which bounces off the Albemarle’s armor and lands back on the Miami and explodes, causing damage and casualties---including killing Captain Flusser, the Miami’s skipper. The USS Miami escapes downriver. The Albemarle follows, dropping down below Plymouth, cutting off the Union garrison from its line of supply.
The new Rebel ironclad carries two large-bore Brooke Rifles, cannons with good range. Each gun pivots and can fire in a 180-degree radius, with the choice to fire out of any of three gunports each.
{[civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+19%2C+1864
D Wednesday, April 19, 1865: The nation mourns U. S. President Abraham Lincoln at his funeral in Washington, D. C.
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D Wednesday, April 19, 1865: FUNERAL SERVICES FOR PRESIDENT LINCOLN. President Andrew Johnson, the Cabinet, Supreme Court justices, members of Congress, military figures and the diplomatic corps in full “court dress” filed into the East Room of the White House. Robert Todd Lincoln represented the family as Mrs. Lincoln and Tad remained sequestered. At the head of the catafalque stood Lieutenant General Ulysses Grant alone. After the brief service, the funeral carriage, escorted by cavalry, infantry, artillery, Marines, their banners draped, and the bands playing sorrowful dirges, carried Lincoln’s body past throngs of people to the rotunda of the Capitol. Now it was the public’s turn, and, until the next evening, they filed past the catafalque in steady streams.
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FYI Maj Marty Hogan MAJ Dale E. Wilson, Ph.D. GySgt Jack Wallace SPC Michael Terrell Maj Bill Smith, Ph.D. CWO3 Dennis M. PO2 Marco Monsalve SPC Woody Bullard 1SG Dan Capri SSG Michael Noll SSG Bill McCoy Lt Col Charlie Brown Lt Col John (Jack) Christensen CSM Charles Hayden LTC Greg Henning LTC David Brown LTC (Join to see) CPT Richard Trione CPL Ronald Keyes Jr SSG (Join to see)
Abraham Lincoln's long goodbye - YouTube
https://www.youtube.com/watch?v=Xf1-NEcIljs

LTC Stephen F. truly awesome post, I am going to go with this one.
1865: FUNERAL SERVICES FOR PRESIDENT LINCOLN. President Andrew Johnson, the Cabinet, Supreme Court justices, members of Congress, military figures and the diplomatic corps in full “court dress” filed into the East Room of the White House. Robert Todd Linc

You mentioned "1861: Virginia forces take control of Harpers Ferry, Virginia" An interesting development from that was that the federal arsenal and manufacturing machinery was taken by the Confederates. They moved the Machinery to Richmond, Va and began to produce muskets there.
The Machinery captured was set to produce the 1855 model Springfield Musket, which used the complicated Maynard primer system. There was a hump like shape on the lock plate to store the roll of Maynard Primers ( like a cap gun). The Confederates initially left the hump but installed a percussion cap system, making the hump only cosmetic. In March of 1862 the hump was eliminated. An original Richmond depot musket with the maynard hump can fetch upwards of 8,000 dollars at auction.
"