 Willoughby was furious that Pym had assumed command of the operation without his permission and the officers exchanged angry letters, part of an ongoing disagreement between them that engendered mutual distrust.With Île de la Passe secure, Pym gave command of the blockade of Grand Port to Willoughby and returned to his station off Port Napoleon with "Iphigenia".Willoughby used his independent position to raid the coastline, landing at Pointe du Diable on 17 August on the northern edge of Grand Port with 170 men and storming the fort there, destroying ten cannon and capturing another.