What was the most significant event on April 13 during the U.S. Civil War?

IMHO the significant event of April 13 for post war recovery was when Maj General Tecumseh Sherman took control of Raleigh he wrote letters granting North Carolina Governor Zebulon Baird Vance safe passage and requesting his return to the city.
Pictures
1. Line engraving published in "Harper's Weekly", 1862, depicting the mortar schooner flotilla commanded by David Dixon Porter during the April 1862 attack on the forts below New Orleans (from left to right): USS Westfield, USS Adolph Hugel, USS Para, USS William Bacon, USS Oliver H. Lee,
USS C.P. Williams, USS Henry Janes, USS George Mangham, USS Racer, USS Horace Beals, USS Sarah Bruen, USS Samuel Rotan, USS John Griffith, USS Rachel Seaman, USS Maria J. Carlton, USS Sidney C. Jones, USS T.A. Ward, USS Sea Foam, USS Maria A. Wood, USS Octorara (Porter's flagship) and USS Matthew Vassar.
2. Maj Gen William Tecumseh Sherman
3. Map of the Lower Peninsula of Virginia, April 1862, Library of Congress
4. 'Kate Cumming' Confederate army nurse Army of Tennessee, 1862


1861: The siege of Fort Sumter is successful for the Confederacy. Chivalry is alive and well at this point. It would begin to end at 1st Bull Run when ladies and gentlemen in their finery came to watch the battle from Washington, D.C.
For many the work, joys and drudgery of life continued throughout the war.
By 1864, in the southern states and the border states of Tennessee and Missouri crime ran rampant in areas where many of the men had gone to war as well as in remote areas.
By 1865 chivalry had begun to return. When Sherman took control of Raleigh he wrote letters granting North Carolina Governor Zebulon Baird Vance safe passage and requesting his return to the city.
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. April 13, 1861: Battle of Fort Sumter, SC: On Saturday, April 13, Anderson surrendered the fort. Incredibly, no soldiers were killed in battle. The generous terms of surrender, however, allowed Major Robert Anderson, garrison commander, to perform a 100-gun salute before he and his men evacuated the fort the next day. The salute began at 2:00 P.M. on April 14, but was cut short to 50 guns after an accidental explosion killed one of the gunners and mortally wounded another. Carrying their tattered banner, the men marched out of the fort and boarded a boat that ferried them to the Union ships outside the harbor. They were greeted as heroes on their return to the North.
http://www.civilwar.org/battlefields/fort-sumter.html?tab=facts
B. 1864: Last night the notorious bushwhacking gang of Shumate and Clark went to the house of an industrious, hard-working German farmer, named Kuntz, who lives some twenty-five to thirty miles from the mouth of Osage River, in Missouri, and demanded his money. He stoutly denied having any cash; but the fiends …deliberately took down a wood-saw which was hanging up in the cabin, and cut his left leg three times below and four times above the knee, with the saw. … His mangled body was found to-day, life extinct. A boy who lived with him, succeeded in making his escape, terror-stricken, to give the alarm. After leaving Kuntz’s, the gang went to an adjoining American farmer, and not succeeding in their demands for money, they destroyed everything in and about the place, took the man out, and literally cut his head off.
C. 1864: Blockade runners captured: U.S.S. Rachel Seaman, Acting Master Charles Potter, seized blockade running British schooner Maria Alfred near the Mermentau River, Louisiana, with an assorted cargo. U.S.S. Nyanza, Acting Lieutenant Washburn, captured schooner Mandoline in Atchafalaya Bay, Louisiana, with cargo of cotton.
http://www.historycentral.com/navy/cwnavalhistory/April1864.html
D. Thursday, April 13, 1865, Sherman took control of Raleigh and wrote letters granting North Carolina Governor Zebulon Baird Vance safe passage and requesting his return to the city. Skirmishing continued between the Union and Confederate cavalry throughout April 13, but the City of Raleigh was not held accountable or punished.
On April 14, 1865 Sherman visited with Thomas Bragg: Braxton Bragg’s brother, a former governor of North Carolina, and a close friend of Sherman’s from before the war. Sherman inquired about Braxton’s welfare and informed Thomas that Raleigh was unmolested. In Greensboro Johnston met with Confederate President Jefferson Davis and convinced him to authorize the suspension of hostilities.
http://northcarolinahistory.org/encyclopedia/confederate-surrender-at-bennetts-place-april-17-26-1865/
1. Sunday, April 13, 1862 --- Kate Cumming, a nurse with the army hospital in the Army of Tennessee (recently the Army of the Mississippi) at Corinth, writes in her diary: I have conversed with some of the wounded prisoners. One of them, quite a young man, named Nott, is very talkative. He says that he dislikes Lincoln and abolitionism as much as we do; declares that he is fighting to save the Union, and nothing more. All of them say the same thing. What a glorious Union it would be!
http://civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+13%2C+1862
2. Monday, April 13, 1863: Federal forces engage Fort Bisland in Bayou Teche, Louisiana
http://blueandgraytrail.com/year/186304
3. Monday, April 13, 1863: Ambrose Burnside issue General Order 38 in which he stated "anyone found guilty of committing acts for the benefit of the enemies of our country will be subject to execution."
http://blueandgraytrail.com/year/186304
4. Sunday, April 13, 1862: In New Mexico, Gen. Henry H. Sibley, commanding the Confederates’ Army of New Mexico, evaluates his position. His army has been weakened by their retreat from Glorieta Pass, and their wagon train was destroyed at that battle. His troops arrive in Santa Fe, and fall back further to Albuquerque. Sibley is concerned that he will be squeezed between the Union force from Ft. Union, now under Col. Gabriel Paul, and the other up from Ft. Craig, under Col. Canby. Canby approaches close enough to lob shells into Albuquerque, and then pulls away, fearing that the rest of the Rebel troops will arrive on their retreat. Canby moves east into Tijera Canyon, where, after a forced march, the 1,100 Federals under Col. Paul join him. Now, with over 2,200 troops, Canby is a tangible threat to the Rebels, who are facing the real possibility of starvation. The Rebels begin the long retreat south to El Paso. The New Mexico Campaign is over.
http://civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+13%2C+1862
5. Sunday, April 13, 1862 --- Peninsula Campaign: On the Virginia Peninsula, McClellan’s army has grown to over 101,000, and is poised seemingly to strike a blow at Yorktown. Gen. Joseph Johnston, in command of the Confederate troops, decides to abandon his new defenses at the Rappahannock, and puts his army on the road to the Peninsula to confront McClellan there.
http://civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+13%2C+1862
6. Monday, April 13, 1863 --- Gen. Hooker’s plans for Stoneman’s great cavalry raid focus on the goal of drawing Lee out of his trenches at Fredericksburg and into the open. Stoneman and his force start out this morning, and as they bivouac for the evening, closer to his expected crossing points over the Rappahannock, temperatures fall below freezing. During the night, the rains begin.
http://civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+13%2C+1863
7. Monday, April 13, 1863 --- Lt. Col. Arthur Fremantle, of Her Majesty’s Coldstream Guards of the Royal Army, has entered Texas over the Rio Grande in order to be the observer of the American war for the British Crown. He tells of his uncomfortable adventures traveling across the mesquite-tangled deserts of southern Texas: We left Brownsville for San Antonio at 11 a.m. Our vehicle was a roomy, but rather over-loaded, four-wheel carriage, with a canvass roof, and four mules. . . . The country, on leaving Brownsville, is quite flat, the road, a natural one, sandy and very dusty, and there are many small trees, principally mosquites. After we had proceeded seven miles, we halted to water the mules.
At 2 p.m. a new character appeared upon the scene, in the shape of an elderly, rough-faced, dirty-looking man, who rode up, mounted on a sorry nag. To my surprise he was addressed by M'Carthy with the title of "Judge," and asked what he had done with our other horse. The judge replied that it had already broken down, and had been left behind. M'Carthy informs me that this worthy really is a magistrate or sort of judge in his own district; but he now appears in the capacity of assistant mule-driver. . . . The judge rides on in front of us on his "Rosinante," to encourage the mules. . . .
Mr Sargent, our portly driver, cheers his animals 26 by the continual repetition of the sentence, "Get up, now, you great long-eared G——d d——d son of a ——."
At 5 p.m. we reached a well, with a farm or ranch close to it. Here we halted for the night. . . .
The water at this well was very salt, and made very indifferent coffee. M'Carthy called it the "meanest halting-place we shall have."
At 8 p.m. M'Carthy spread a bullock-rug on the sand near the carriage, on which we should have slept very comfortably, had it not been for the prickles, the activity of many fleas, and the incursions of wild hogs. Mr Sargent and the Judge, with much presence of mind, had encamped seventy yards off, and left to us the duty of driving away these hogs. I was twice awoke by one of these unclean animals breathing in my face.
http://civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+13%2C+1863
8. Monday, April 13, 1863 --- Sarah Morgan, a young woman of Louisiana, is on the road with her refugee family, on their way another refuge. She records in her journal about a stop at the house of friends, and how some in her party found wild strawberries, and how this led to a proposal: I have but one disagreeable impression to remember in connection with the trip, and that occurred at a farmhouse two miles from here, where we stopped to get strawberries. I preferred remaining in the carriage, to the trouble of getting out; so all went in, Mr. Halsey dividing his time equally between Miriam in the house and me in the carriage, supplying me with violets and pensées one moment, and the next showing me the most tempting strawberries at the most provoking distance, assuring me they were exquisite. The individual to whom the carriage belonged, who had given up the reins to Mr. Halsey, and who, no doubt, was respectable enough for his class in his part of the country, would allow no one to bring me my strawberries, reserving the honor for himself. Presently he appeared with a large saucer of them covered with cream. I was naturally thankful, but would have preferred his returning to the house after he had fulfilled his mission. Instead, he had the audacity to express his admiration of my personal appearance; without a pause gave me a short sketch of his history, informed me he was a widower, and very anxious to marry again, and finally, — Lams and Penates of the house of Morgan ap Kerrig, veil your affronted brows! You will scarcely credit that the creature had the insolence to say that — he would marry me tomorrow, if he could, and think himself blessed; for the jewel of the soul must be equal to the casket that contained it! Yes! this brute of a man had the unparalleled audacity to speak to me in such a way!
http://civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+13%2C+1863
9. Wednesday, April 13, 1864: Admiral David Porter arrives at Grand Ecore, Louisiana
http://blueandgraytrail.com/year/186404
10. Wednesday, April 13, 1864 --- Sergeant Alexander G. Downing, of the 11th Iowa Infantry Regiment, is at home on furlough, helping his father put in the crops: It is cloudy and very cool. I helped father put in his wheat today, harrowing all forenoon and drilling in wheat in the afternoon. James Kelley, a soldier of the neighborhood, home on a furlough, came over to help me out for a few days.
http://civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+13%2C+1864
11. Wednesday, April 13, 1864 --- Lt. Gen. James Longstreet and his troops, released from duty in East Tennessee, have arrived in the vicinity of Charlottesville, Virginia, and preparing to join with Lee in the coming spring campaign.
http://civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+13%2C+1864
A Saturday, April 13, 1861: Beginning at 4:30 am on the 12th and continuing until the morning of the 13th, Confederate batteries along the shore of Charleston Harbor fire on Fort Sumter under the command of Major Robert Anderson. Anderson arranges a surrender with Texas Senator Louis Wigfall on the morning of the 13th.
http://blueandgraytrail.com/year/1861
B Wednesday, April 13, 1864 --- A ghastly report from the newspaper Missouri Democrat details atrocities all too common in the internecine warfare typical for Missouri at this point in the war: Last night the notorious bushwhacking gang of Shumate and Clark went to the house of an industrious, hard-working German farmer, named Kuntz, who lives some twenty-five to thirty miles from the mouth of Osage River, in Missouri, and demanded his money. He stoutly denied having any cash; but the fiends, not believing him, or perhaps knowing that he did have some money, deliberately took down a wood-saw which was hanging up in the cabin, and cut his left leg three times below and four times above the knee, with the saw. Loss of blood, pain, and agony made the poor fellow insensible, and he was unable to tell where the money was concealed. His mangled body was found to-day, life extinct. A boy who lived with him, succeeded in making his escape, terror-stricken, to give the alarm. After leaving Kuntz’s, the gang went to an adjoining American farmer, and not succeeding in their demands for money, they destroyed everything in and about the place, took the man out, and literally cut his head off.
http://civilwarsesquicentdaily-wolfshield.blogspot.com/search?q=April+13%2C+1864
C Wednesday, April 13, 1864 1864: Blockade runners captured: U.S.S. Rachel Seaman, Acting Master Charles Potter, seized blockade running British schooner Maria Alfred near the Mermentau River, Louisiana, with an assorted cargo. U.S.S. Nyanza, Acting Lieutenant Washburn, captured schooner Mandoline in Atchafalaya Bay, Louisiana, with cargo of cotton.
http://www.historycentral.com/navy/cwnavalhistory/April1864.html
D Thursday, April 13, 1865: in early April 1865, Virginia fell to the Union with the capture of Richmond and Petersburg. Union General William T. Sherman, who desperately wanted to be a part of Lee’s surrender, proceeded with the last part of his Carolinas Campaign and marched to Raleigh, North Carolina. Confederate General Joseph E. Johnston moved his forces in position to guard Raleigh against the attack. The Confederate cavalry mounted resistance on the road from Goldsboro to Raleigh and the small skirmishes slowed the advance of the Union forces. Sherman did not learn of Lee’s surrender at Appomattox Court House (April 9, 1865) until April 11.
On April 12, North Carolina Governor Zebulon Baird Vance sent commissioners to meet Sherman and discuss the end of hostilities. After delays caused by both Confederate and Union forces, the message reached Sherman, and he agreed to meet with North Carolina government officials. However, because of the delays, the members of government in Raleigh fled the capital. The mayor of Raleigh, William H. Harrison, prepared to surrender the city hoping the capital building and museum would be spared. On April 13, 1865, Sherman took control of Raleigh and wrote letters granting North Carolina Governor Zebulon Baird Vance safe passage and requesting his return to the city. Skirmishing continued between the Union and Confederate cavalry throughout April 13, but the City of Raleigh was not held accountable or punished.
On April 14, 1865 Sherman visited with Thomas Bragg: Braxton Bragg’s brother, a former governor of North Carolina, and a close friend of Sherman’s from before the war. Sherman inquired about Braxton’s welfare and informed Thomas that Raleigh was unmolested. In Greensboro Johnston met with Confederate President Jefferson Davis and convinced him to authorize the suspension of hostilities.
http://northcarolinahistory.org/encyclopedia/confederate-surrender-at-bennetts-place-april-17-26-1865/
LTC Stephen C. CSM Charles Hayden SGT John " Mac " McConnell LTC (Join to see) SPC (Join to see) MSG Andrew White SSG Franklin Briant SGT Tiffanie G. SGT Mary G. SFC Randy Purham PO3 Phyllis MaynardCPL Ronald Keyes Jr CPT Chris Loomis CDR (Join to see) SFC William Farrell SPC Michael Terrell SPC Michael Duricko, Ph.D Sgt John H. SGT John Melvin Kim Bolen RN CCM ACM

Imagine to dress up and go to a battlefield. To be a spectator of war and death.... Human Nature being the curious one. Like watching Nascar waiting for a wreck to unfold. Thanks LTC Stephen F. . I do enjoy the small things mentioned in your articles.

Maj. Anderson had taught Gen. Beuregard, CSA, artillery/engineering skills many years previously at West Point. The pupil here actually became the teacher!