The Regiment was authorized on April 23, 1775 in the Massachusetts State Troops as David Brewer’s Regiment. Organized in spring 1775 at Roxbury to consist of 10 companies from Berkshire, Hampshire, Worcester, Bristol and Plymouth Counties. Adopted on June 14, 1775 into the Continental Army and assigned to the Main Continental Army. It was assigned on July 22, 1775 to Thomas’ Brigade, an element of the Main Continental Army. Consolidated (less Danforth’s Company) on January 1, 1776 with Read’s Regiment and consolidated unit re-designated as the 13th Continental Regiment; concurrently, Danforth’s Company reorganized as Danforth’s Company, 6th Continental Regiment.