The Battle of the Nile was fought between the Royal Navy and the French Navy at Aboukir Bay in Egypt between 1 and 3 August 1798. It was the climax of the Mediterranean campaign of 1798, which had started three months earlier after a large French fleet sailed from Toulon to Alexandria carrying an expeditionary force under Napoleon. A British fleet, led by Rear-Admiral Sir Horatio Nelson, decisively defeated a French fleet under Vice-Admiral François-Paul Brueys d'Aigalliers, which had escorted Napoleon's army to Egypt.