Home State: Massachusetts
Command Billet: Battery Commander
Branch of Service: Artillery
see his Battle Report
From Boston, he was pre-war Major commanding the Boston Light Artillery, a militia unit organized in 1853. He and that battery departed for Fortress Monroe in April 1861. They were stationed at Annapolis, Maryland, accepted into Federal Service for 3 months in May, then were stationed at Relay House guarding the B&O Railroad near Baltimore. They were mustered out in August.1
Cook then organized another battery, the 8th Massachusetts Light, returning to service as their Captain in late June 1862.
On the Campaign
Part of his battery was engaged on 14 September at Fox's Gap, dueling with a Confederate battery (likely Bondurant's) at close range, taking casualties. They were in action with the IX Corps above the Lower Bridge on the afternoon of the 17th at Antietam.
The rest of the War
Cook and the 8th Battery remained in the vicinity of Sharpsburg into October, served in the Washington Garrison, and were then mustered out of service at expiration of their 6 month term in November 1862.2 There is nothing known about Cook's further military service, if any.
After the War
1 Dyer, Frederick H., A Compendium of the War of the Rebellion, Des Moines, Iowa: The Dyer Publishing Co., 1908 [AotW citation 561]
2 Higginson, Thomas Wentworth, Massachusetts in the Army and Navy during the war of 1861-1865, 2 vols., Boston: Wright & Potter Printing Co., State Printers, 1895-6, Vol. 1, pg. 187 [AotW citation 562]
3 Miller, Francis Trevelyan, editor in chief, Photographic History of the Civil War, 10 vols., New York: The Review of Reviews Co., 1911-12, Vol. 5, pg. 26 [AotW citation 563]