Battles of Saratoga - Wikipedia

On October 17, 1777, British General John Burgoyne surrendered at Saratoga during the American Revolutionary War. From the article:

"Burgoyne had lost 1,000 men in the two battles, leaving him outnumbered by roughly 3 to 1; American losses came to about 500 killed and wounded. Burgoyne had also lost several of his most effective leaders, his attempts to capture the American position had failed, and his forward line was now breached. After the second battle, Burgoyne lit fires at his remaining forward positions and withdrew under the cover of darkness. He withdrew his men 10–15 miles north, near present-day Schuylerville, New York. By the morning of October 8, he was back in the fortified positions he had held on September 16.

On October 13, with his army surrounded, Burgoyne held a council of war to propose terms of surrender. Riedesel suggested that they be paroled and allowed to march back to Canada without their weapons. Burgoyne felt that Gates would not even consider such terms, asking instead to be conveyed to Boston, where they would sail back to Europe. After several days of negotiations, the two sides signed the capitulation.[81]

On October 17, Burgoyne surrendered his army to Gates. The British and German troops were accorded the traditional honors of war as they marched out to surrender. The troops formed the Convention Army, named after the convention that granted them safe passage back to Europe. However, the Continental Congress revoked the convention, and the Convention Army was kept in captivity until the end of the war.[82]"