On 17 July Rear Admiral Sir Richard Keats arrived on "Implacable" to take charge of the British support of the Spanish in the Siege of Cádiz. Marshal Victor's French army had completely blockaded the Isla de León by land and were further fortifying the coast with works that supplemented the existing defences. Eleven or twelve British and Spanish line-of-battle ships anchored as close to shore as they could without grounding. The allied troops defending Leon consisted of 16,500 Spaniards, 4,000 British and Germans, and 1,400 Portuguese.