At the start of the American Revolutionary War, news was often read to congregations in their churches. It was one of the main forms of communication at the time. On December 10, 1776, General George Washington called out the militia of Pennsylvania. He wrote to the colonels of the militias of Northampton and Bucks counties asking them and their men to join him as quickly as possible. Rev. Rosebrugh read General Washington's letter to his congregation. The men of the congregation formed a company of militia and agreed to go to war "if" Rev. Rosbrugh would lead them. He had expected to accompany them as their chaplain but reluctantly agreed to lead them. John Rosbrugh took his place at the head of the company and slinging his musket over his shoulder led the company to join General Washington and the Continental Army in Philadelphia.