César was a mercantile brig launched in 1802 that the French Navy purchased at Bordeaux in 1803.

On 14 July the boats of the squadron were taken by Iris to Captain John Tremayne Rodd in Indefatigable off Rochefort to attack two French corvettes and a convoy at the entrance to the Garonne.

The weather on 15 July appeared suitable for the attempt but after the boats left a strong wind blew up and although they managed to capture Caesar [sic], they could not prevent the convoy escaping up river.

[3] The vessels claiming prize money included Pilchard and the hired armed lugger Nile, in addition to the various ships of the line and frigates.

[6] Caesar, of 18 guns, had a crew of 86 men according to her roster, and was under the command of lieutenant de vaisseau Louis François Hector Fourré.