the time and was to continue for 2 years, obliterating any architectural heritage from the Spanish period. Unable to starve the garrison out, the French and Spanish attempted further attacks by land and sea. The night before the Grand Attack on 27 November 1781, the British garrison filed silently out of their defence works and made a surprise sortie, routing the besieging infantry in their trenches and postponed the grand assault on The Rock for some time. On 13 September 1782 the Bourbon allies launched their great attack; 5190 fighting men, both French and Spanish, aboard ten of the newly engineered 'floating batteries' with 138 heavy guns, as well as 18 ships of the line, 40 Spanish gunboats and 20 bomb-vessels with a total of 30,000 sailors and marines. They were supported by 86 land guns and 35,000 Spanish and French troops (7,000–8,000 French) on land intending to assault the fortifications once they had been demolished. The 138 guns opened fire from floating batteries in the Bay and the 86 guns on the land side, directed on the fortifications after weeks of preparatory artillery fire. But the garrison replied with red-hot shot to set fire to and sink the attacker's floating batteries and warships in the Bay. The British destroyed three of the floating batteries, which blew up as the 'red-hot shot' did its job. The other seven batteries were scuttled by the Spanish. In addition 719 men on board the ships (many of whom drowned) were casualties. In Britain the Admiralty considered plans for a major relief of Gibraltar, opting to send a larger, but slower fleet, rather than a smaller faster one. In September 1782 a large fleet left Spithead under Richard Howe, arriving off Cape St. Vincent on 9 October. The following evening a gale blew up, scattering the Spanish and French fleet and allowing Howe to sail unopposed into Gibraltar. A total of 34 ships of the line escorted 31 transport ships, which delivered supplies, food, and ammunition. The fleet also brought the 25th, 59th, and 97th regiments of foot bringing the total number of the garrison to over 7,000 Howe then sailed out and fought an indecisive battle with the combined allied fleet before withdrawing to Britain in line with his orders. The siege was continued for some months longer, but in the spring of 1783 a preliminary peace agreement brought the cessation of hostilities.