Admiral Byron had been alerted to the French action at Saint Vincent, and was sailing with a force to recapture it. When news arrived that the French were at Grenada, he immediately changed course to meet them. The British fleet consisted of 21 ships of the line and 1 frigate. Because he was escorting troop transports and was short of frigates, three ships of the line were assigned duty to escort the transports. Admiral d'Estaing was warned on July 5 of Byron's approach, and promptly reembarked most of his troops. His fleet consisted of 25 ships of the line and a large number of frigates and smaller vessels. Admiral Byron was unaware of d'Estaing's full strength, since during his absence d'Estaing had been reinforced by a squadron from Europe under Lamotte-Picquet.