He served as a captain in the Connecticut Militia during the American Revolutionary War.
He was the son of Deacon Peter Lockwood and Mary Hawley.
At the beginning of the war, on July 12, 1775, Lockwood enlisted in the First Company of Colonel Charles Webb's Seventh Connecticut Regiment, and was discharged December 24, 1775.
On July 21, 1778, he gave his bond for $5000 as security to Henry Laurens, Esq., President of the Continental Congress or his successor in office, for faithfully executing the office and trust of an Assistant Commissary of Issues in the American Army.
Lockwood organized the first voluntary fire department in Norwalk.