- 1825
| Oct 20 | Daniel Edgar Sickles is born in New York City. His grandfather, who was of Knickerbocker stock, retained the name of Van Sickles, but the father of Gen. Sickles dropped the Dutch prefix. | Ref: 68 |
- 1859
| Feb 19 | Dan Sickles is acquitted of murder on grounds of temporary insanity first time this defense is successfully used. | Ref: 5 |
| Feb 24 | Dan Sickles is tipped off by an anonymous letter that his wife Teresa is having an affair with Barton Key, the son of Francis Scott Key. (Ref: "Great American Trials", ISBN 0-8103-9134-1, 1994) | |
| Feb 27 | In a fit of jealous rage, Dan Sickles murders Philip Barton Key (United States Attorney for the District of Columbia, son of Francis Scott Key) in broad daylight near the White House for having an affair with his wife Teresa. (Ref: "Great American Trials", ISBN 0-8103-9134-1, 1994) | |
| Apr 04 | Dan Sickles goes on trial for the murder of Barton Key. His attorney is the flamboyant James Brady. (Ref: "Great American Trials", ISBN 0-8103-9134-1, 1994) | |
| Apr 26 | Dan Sickles is found not guilty of the murder of Barton Key by reason of temporary insanity. This is the first use of "temporary insanity" to prove innocence. (Ref: "Great American Trials", ISBN 0-8103-9134-1, 1994) | |
- 1861
| Jun 20 | Dan Sickles is commissioned a colonel of the 70th New York in the Union Army. Ref | |
| Sep 03 | Colonel Dan Sickles is promoted to brigadier general of the US Volunteers. Ref | |
| Oct 03 | Brigadier General Dan Sickles accepts command of the 2nd ("Excelsior") Brigade, Hooker's Division, Army of the Potomac. Ref | |
- 1862
| May 24 | Brigadier General Dan Sickles commands the 2nd ("Excelsior") Brigade, 2nd Division, 3rd Corps, Army of the Potomac. Ref | |
| May 31 | Brigadier General Dan Sickles and his brigade get their first taste of war at the Battle of Fair Oaks on the Virginia Peninsula. Ref | |
| Sep 05 | Brigadier General Dan Sickles commands the division. Ref | |
| Nov 29 | Brigadier General Dan Sickles is promoted to Major General. Ref | |
- 1863
| Feb 05 | Major General Dan Sickles commands the corps. Ref | |
| Jul 02 | Major General Dan Sickles tries all day to get General Meade's permission to advance his men to prevent the Confederates from setting up their artillery on a ridge above his troops. Finally, at 2 p.m., tired of waiting for Meade, he went ahead with his plans. "But that took them out of line with the rest of the Union troops," says Keneally. "So some people say he opened up a near-fatal gap." In the midst of it all, Sickles' leg was crushed by a cannonball. That turned him into something of a hero in many people's eyes, and may actually have saved him for being court-martialed. Ref | |
- 1868
| Jan 01 | Daniel Sickles is mustered out of the Army. |
- 1869
| Apr 14 | Daniel Sickles is placed on the retired list with the full rank of Major General. |
| May 10 | (date given as Spring 1869) President Grant having tendered to Gen. Sickles the mission to Mexico, which was declined, appointed him United States Minister to Spain. |
- 1871
| Nov 28 | General Daniel Sickles, serving as Ministor to Spain, marries Senorita Carmina Creagh, the daughter of Chevalier de Creagh of Madrid, a Spanish Councillor of State, at the American Legation in Madrid. |
- 1874
| May 20 | Daniel Sickles leaves his post as Minister to Spain. |
- 1912
| Dec 10 | (date unspecified) Daniel Sickles was deposed as Chairman of the New York Monuments Commission, which had headed during the twenty-six years of its existence. There was a shortage of $27,000, and there was some talk of arresting the old soldier, but nothing came of it. |
- 1914
| May 03 | Daniel Sickles dies at 9:10 PM at his home, 23 Fifth Avenue at age 91. |
| May 09 | General Daniel Sickles is buried at Arlington National Cemetary. |
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Dan Sickles Chronology