Washington was elected a captain of Stafford County Minutemen on September 12, 1775, and became part of the 3rd Virginia Regiment, Continental Line on February 25, 1776, commanding its 7th Company. His lieutenant and second-in-command was fellow Virginian James Monroe, future fifth US. President. Their first combat was the Battle of Harlem Heights in New York on September 16, 1776, during which he may have been wounded by enemy musket fire. At the Battle of Trenton, under command of Nathanael Greene and after a night of scouting the countryside with Monroe to prevent detection, Washington led a successful assault into the town. His company drove in Hessian pickets, and seized two cannon on King Street, capturing their crews. Washington received wounds to both hands during the action, along with Lt. Monroe who was severely wounded in the shoulder. Both received thanks from Continental Army commander-in-chief George Washington.