The French planned to invade the British Isles during 1759 by accumulating troops near the mouth of the Loire and concentrating their Brest and Toulon fleets. However, two sea defeats prevented this. In August, the Mediterranean fleet under Jean-François de La Clue-Sabran was scattered by a larger British fleet under Edward Boscawen at the Battle of Lagos. In the Battle of Quiberon Bay on 20 November, the British admiral Edward Hawke with 23 ships of the line caught the French Brest fleet with 21 ships of the line under Marshal de Conflans and sank, captured, or forced many of them aground, putting an end to the French plans.