Erastus Blackmar enlisted in the Connecticut 11th Regiment of Infantry on October 3, 1861. He served as Sergeant Major from February 5, 1863 to April 9, 1864, when he was commissioned as a second lieutenant. Little more than a month later, on May 16, 1864, he was wounded at Drewry's Bluff, Virginia. He was promoted to captain on December 10, 1864. Blackmar was mustered out with his regiment on December 21, 1865.

The Connecticut 11th Infantry was an active regiment, participating in: Burnside's expedition to Hatteras Inlet and Roanoke Island, N. C., January 7-February 8, 1862; Battle of Roanoke Island February 8; Maryland Campaign, September-October; Battle of South Mountain, September 14; Battle of Antietam, September 16-17; Battle of Fredericksburg, Va., December 12-15; Burnside's 2nd Campaign, "Mud March," January 20-24, 1863; Siege of Suffolk, April 12-May 4; Edenton Road, April 24; Providence Church Road and Nansemond River, May 3; Siege of Suffolk, May 4; Reconnaissance to the Chickahominy, June 9-16; Dix's Peninsula Campaign, June 24-July 7; Expedition from White House to South Anna River, July 1-7; Butler's operations on south side of the James River and against Petersburg and Richmond May 4-28, 1864; Occupation of Bermuda Hundred, Va., May 5; Port Walthal Junction, Chester Station, May 7; Swift Creek or Arrow field Church, May 9-10; Operations against Fort Darling, May 12-16; Battle of Drewry's Bluff, May 12-16; On Bermuda Hundred front, May 17-27; Moved to White House, thence to Cold Harbor May 27-31; Battles about Cold Harbor, June 1-12; Before Petersburg, June 15-18; Siege operations against Petersburg and Richmond June 16, 1864 to April 2, 1865; Mine explosion Petersburg, July 30, 1864; On Bermuda Hundred front, August 25 to December, and on north side of the James before Richmond until April, 1865. e father of Mary Helen Blackmar, born Nov. 30, 1873 in Woodstock, CT

Submitted by: Farrar 47348938
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Erastus Blackmar married Sarah Helen Bigelow on December 24, 1863.