The Christian soldier's duty; the lawfulness and dignity of his office; and the importance of the Protestant cause in the British colonies, stated and explained. A sermon, preached April 5, 1757. In Christ-Church, Philadelphia, to the First Battalion of His Majesty's Royal American Regiment; at the request of their colonel and officers. / By William Smith, A.M. provost of the College and Academy of Philadelphia. ; To which is annexed, a prayer on the same occasion.