 Coastal batteries opened fire, joined by Spanish warships anchored at harbour, and drove the attackers back, causing the British to lose grip over the blockade and allowing several merchant convoys to slip in and out of the port.An air of mutiny spread over the British crews as their long stay at sea stretched on without results.In April Jervis shifted his gaze to Tenerife upon hearing that Spanish treasure convoys from America arrived regularly at that island.