The Tartar fell down to Kingroad. It was necessary always to have a Man of War there, or about Midway between Nantasket and Boston, to board and examine all Vessels passing up and down and to repeat Signals to and from the Ships at Nantasket or in the Mouth of the Harbour; but after the Battle of Lexington it became further necessary for the Protection and Security of Castle William, and for Ships and Boats going up and down the Harbour, against Attacks from the Rebels in Whale Boats.