The fate of the French fleet at the Siege of Toulon marked one of the earliest significant operations by the British Royal Navy during the French Revolutionary Wars. In August 1793, five months after the National Convention declared war on Great Britain, thus drawing Britain into the ongoing War of the First Coalition, the government of the French Mediterranean city of Toulon rose up against the Republican national government in favour of the Royalist faction. Toulon was the principal French naval port on the Mediterranean and almost the entirety of the French Mediterranean Fleet was anchored in the harbour. After negotiations the British commander in the Mediterranean, Admiral Lord Hood, the city's Royalists seized control and British forces, alongside allies from Spain, Naples and Sardinia entered the city, seizing the fleet and preparing defences against the inevitable Republican counterattack.
Although powerfully fortified against attack by sea, Toulon's extensive defences on the landward side of the city had been designed to be held by substantial numbers of troops, something the allies conspicuously lacked. This weakness would be ruthlessly exposed by a highly effective Republican artillery campaign commanded by Captain Napoleon Bonaparte. Political disputes with the Italian allies prevented reinforcements reaching the defenders and the defeat of Royalist forces elsewhere in France gave strength to the besieging army. On 17 December the Republican forces captured heights overlooking the harbour and the defenders' situation became untenable. Hood ordered an evacuation and as the Allied forces staged a fighting withdrawal British Captain Sir Sidney Smith and Spanish Don Pedro Cotiella volunteered to lead boat parties into the harbour to destroy the French fleet, which remained at anchor.
The boat parties came under heavy fire from the shore as they used fireships to ignite the anchored warships, Smith concentrating on those ships in the New Arsenal while the Spanish were instructed to burn the warehouses and Old Arsenal. For reasons that remain unclear, but which British historians have sometimes attributed to treachery, the Spanish failed to destroy the ships they were tasked with, and as the force withdrew detonated two powder hulks they were instructed to sink dangerously close to Smith's men, killing several. By morning of 19 December, eight French ships of the line and three frigates had been destroyed, while Hood had successfully removed three ships of line and six frigates which were distributed to the Allied navies. As Smith burnt the fleet, ships from the British squadron at Toulon successfully removed the Allied garrison as well as more than 14,000 Royalist refugees. The remainder of the French Mediterranean Fleet survived and was repaired during 1794, participating in many of the battles which followed.