Calvert, anxious to establish the rights of his brother, sent two ships to the Isle of Kent, and these were attacked by the crew of a pinnace belonging to Clayborne, lives being lost on both sides. The quarrel continued with so much fervour that it became merged in the greater struggle of the Civil War. Calvert was granted by the King letters of marque for privateering purposes, and he took good care to prey upon his enemy, Clayborne, whose friend Ingle had been furnished with similar letters from Parliament. Thus having placed the quarrel which was really personal under the banners of King and Parliament, the two rivals contended with each other. The Parliamentary forces were, at first, successful; Ingle and Clayborne invaded Maryland, seized St Mary's, and Calvert was obliged to fly. But with assistance from Governor Berkeley of Virginia, he returned and drove out the Clayborne faction which had disgusted the people by its incapacity and greed. The quarrel ceased for a short time, owing to Calvert's death; but it was not long before it was renewed. Lord Baltimore appointed as his deputy William Stone, an ardent nonconformist and Parliamentarian, who repaid the Proprietor's generosity by leaguing with the people of the Isle of Kent. Traitor though he was, it is to be remembered that during his period of rule one good act was passed. Maryland was already celebrated for its toleration, but in 1649 it was still further enacted that a Christian was not to be "in any ways molested or discountenanced for or in respect of his or her religion, nor in the free exercise thereof."[71]