The company was first assigned to Gen. Lander's Brigade, which formed a part of Gen. Stone's force at Poolesville, Md. It remained on the upper Potomac under Gen. Lander until his death in March, 1862, then served for a time under Gen. Shields. During the siege of Yorktown in April, 1862, the company became attached to the 15th Mass. Regt. of Gorman's Brigade, Sedgwick's Division, Sumner's (2d) Corps. With this command the sharpshooters served through the Peninsular campaign, the Antietam campaign, and until the following spring.
The company lost during service 3 Officers and 21 Enlisted men killed and mortally wounded and 15 Enlisted men by disease. Total 39.
Dyer, Frederick H. A Compendium of the War of the Rebellion. Vol. 2. Powder Springs, GA Eastern Digital Resources, 2003 Ref. A concise summary of the regiment's service.
Massachusetts. AGO. Massachusetts Soldiers, Sailors and Marines in the Great Civil War. Norwood, MA: Norwood Pr, 1931. pp. 682-734. E513.3M32v1. Contains a roster of the regiment.