abstract | - Under the terms of a secret convention Spain had to pay 72 million francs annually to France, until it declared war on Britain. The British had learned of the treaty, and knew it was likely that Spain would declare war soon after the arrival of the treasure ships. Since the British also knew that by law the fleet could only land at Cádiz, as well as its place and approximate time of departure from South America, it was not difficult to position a squadron to intercept it. Bustamante had set sail from Montevideo on 9 August 1804 with four frigates loaded with gold and silver, as well as much other valuable cargo. On 22 September Vice Admiral Lord Collingwood ordered Captain Graham Moore, commanding the 44-gun frigate HMS Indefatigable, to intercept and detain the Spanish ships, peacefully, if possible. Moore's ship arrived off Cadiz on 29 September and was joined on 2 October by HMS Lively, and by HMS Medusa and HMS Amphion the day after. In line abreast they patrolled the approaches to Cádiz.
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