In July 1780,
Montréal was escorting six ships destined for
Algiers. She was under the command of Captain de Vialis de Fontbelle, who was also in charge of the convoy. The convoy successfully anchored beneath the guns of Cachique. During the opening of close combat, de Vialis de Fontbelle had received two mortal wounds, one to the right arm and one to the left calf. He therefore turned over command to his second-in-command, the Count of LaPorte-Yssertieux, before dying.
Montréal demasted one of the English vessels, which led the brigs to disengage to protect her. By 9:30, the English commander signaled withdrawal. The two-hour engagement was inconclusive.
Minorca suffered two men killed, while three men were killed and two wounded on
Porcupine. The convoy suffered four dead, including Captain de Vialis de Fontbelle. Later, three English ships gave chase when the convoy lifted anchor, however the convoy had lost them by 11:00, and reached Algiers intact. For his conduct in the action, la Porte-Yssertieux received a promotion to brevet de capitaine de vaisseau (Brevet Captain). ==Fate==