By 2 June, with his ammunition almost exhausted and water supplies running critically short, Maurice opened negotiations. At five o'clock Maurice agreed to surrender Diamond Rock. The British had two men killed and one man wounded in the battle. French casualties were harder to judge, Maurice estimated they amounted to seventy, the French commander of the landing force made a 'hasty calculation' of fifty. Maurice and his men were taken off the rock on the morning of 6 June and put on board the "Pluton" and "Berwick". They were returned to Barbados by 6 June. As Diamond Rock was legally considered a Royal Navy vessel, and the commander was legally "captain" of it, he was tried by court-martial on 28 June (as the law dictated in any case where a captain loses his ship, regardless of the cause) for its loss. The court unanimously acquitted him, noting   Vice-Admiral Horatio Nelson, who had arrived in the West Indies in pursuit of Villeneuve's fleet, apologised to Maurice for having arrived too late to prevent the fall of Diamond Rock. Maurice returned to England in August and Nelson arranged for him to take command of the 18-gun brig-sloop on 20 August. Maurice was to join Nelson off Cadiz, but she could not be manned in time, and Maurice missed reuniting with Nelson prior to Nelson's death at Trafalgar. After two years in the Channel, Maurice and "Savage" sailed to the West Indies. While in command of "Savage", in early December 1807 Maurice captured the Spanish privateer "Quixote" of Port Cavallo. "Quixote" was armed with eight guns and had a crew of 99 men. She was a "Vessel of a large Class, and fitted out for the Annoyance of the Trade to [Jamaica]". Maurice again returned to the West Indies in July 1808, joining the fleet at Barbados under Sir Alexander Cochrane. He carried with him a letter of recommendation from the Admiralty, and Cochrane appointed him governor of Marie-Galante, a commission confirmed by the Admiralty on 18 January 1809 with a promotion to post-captain. Marie-Galante had not been long in British possession, and there was the risk of an uprising. Maurice had only 400 soldiers under his command, many of whom were seriously ill. A regiment was raised from the black population, but its loyalty was suspect.