In June 1776, Ephraim enlisted for five months as a Private in Captain Seth Newton's Company, 6th Worcester County Regiment of Massachusetts Militia commanded by Colonel Jonathan Smith. Colonel Smith's Regiment was raised to reinforce the Continental Army. Captain Newton with his Company of 73 men marched "to the northward or Canada Department" (now Northern New York State). Ephraim served out his five month term. Later that year, in December 1776, Ephraim enlisted for three months in Captain Elijah Bellows' Company, Colonel Nathan Sparhawk's (Sparrowhawk's) Regiment of men enlisted or drafted from the Worcester County Brigade. This Company went to and served out their enlistment in New Jersey.

On August 21, 1777, Ephraim marched as a Private in Captain John Maynard's Company, Colonel Job Cushing's 6th Worcester County Regiment of Massachusetts Militia responding to the Bennington, Vermont Alarm (The Battle of Bennington, August 16, 1777). The Company marched to Hadley, Hampshire County, Massachusetts. They were discharged, August 23, 1777. About one month later, September 29, 1777, Ephraim marched with a Detachment under the command of Captain Maynard, Colonel Cushing's Regiment. The detachment marched to Stillwater (Saratoga, New York) under the command of Lieutenant Colonel Moses Wheelock on an alarm to serve 30 days. The Detachment was discharged, October 14, 1777, after 24 days service.

In December 1777, Ephraim enlisted for three months in Captain Elijah Bellow's Company, Colonel Job Cushing's Regiment of men enlisted or drafted from the Worcester County Brigade. This Company also went to and served out their enlistment in New Jersey.

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