Timothy W. Rosseter is listed as serving as a Surgeon's Mate of Fellow's Massachusetts Regiment from May to December 1775 and as a Surgeon's Mate in the 19th Continental Infantry from January 1 to December 31, 1776. He is also noted in Georgia's Roster of the Revolution as being a Surgeon's mate and Surgeon as well. Dr. Rossiter served in the Continental Troops, Second Regiment, Light Dragoons. The Second Regiment Light Dragoons was commissioned by Congress at General Washington's request on December 12, 1776. Washington directed the Regiment's commander, Elisha Sheldon of Litchfield, Conn. to choose "gentlemen of true spirits and of good character." In the next five months, the Regiment was mustered and trained at Wethersfield, Conn. by Major Benjamin Tallmadge. On the 6th of June 1777, after hearing local pastor Judah Champion exhort them "to be the avenging angels of destiny", they rode to support Washington's New Jersey campaign.