February 28 - William Washington is born in Stafford County, Virginia.
1775
- William Washington is elected Captain of the newly formed 3rd Virginia Regiment. August - William Washington sees action at the Battle of Harlem Heights.
1777
- William Washington is promoted to Major of the 4th Continental Light Dragoons.
1778 November - William Washington is ordered to "contingently take command" of the 3rd Dragoons
- William Washington is promoted to Lieutenant Colonel.
1779
- William Washington and the 3rd Dragoons are ordered to South Carolina.
1780 March 27 - William Washington skirmishes with Lt. Colonel Banastre Tarleton near Sandy Hill. April 14 - William Washington is at the Battle of Monck's Corner, South Carolina. May 6 - William Washington is at Lenud's Ferry, South Carolina. December 4 - William Washington skirmishes at Rugeley's Farm. December - William Washington skirmishes at Hammond Stores.
1781 January 17 - William Washington sees action at the Battle of Cowpens, North Carolina. March 15 - William Washington sees action at the Battle of Guilford Courthouse. April 25 - William Washington sees action at the Battle of Hobkirk's Hill. September 8 - William Washington is captured at the Battle of Eutaw Springs.
1782 April 21 - William Washington marries Jane Elliot in Charleston, South Carolina
