Because Boston was besieged after the battles of Lexington and Concord, Revere could not return to the city, which was now firmly in British hands. He boarded in Watertown, where he was eventually joined by Rachel and most of his children (Paul Jr., then 15, remained in Boston to mind the family properties). After he was denied a commission in the Continental Army, he tried to find other ways to be useful to the rebel cause. He was retained by the provincial congress as a courier, and he printed local currency which the congress used to pay the troops around Boston.