Battle of Grand Port - French Response

French Response

When news of the arrival of Duperré's squadron reached Decaen at Port Napoleon, he immediately despatched fast couriers to Grand Port and ordered Hamelin's squadron, consisting of the frigates Vénus, Manche, Astrée and the brig Entreprenant, to make ready to sail in support of Duperré. Hamelin departed Port Napoleon at midnight on 21 August, intending to sail northeast and then south, down the island's eastern shore. On 23 August, Hamelin's squadron spotted and captured a British transport ship named Ranger, sent 24 days earlier from the Cape of Good Hope with 300 tons of food supplies and extensive naval stores for Rowley on Île Bourbon. On rounding the northern headlands of Isle de France however, Hamelin found he could make no progress against the headwinds and reversed direction, passing the western shore of the island and arriving off Grand Port at 13:00 on 27 August.

The two extra days Hamelin had spent rounding Isle de France saw activity from the British forces remaining at Grand Port. There had been no strong winds in the bay and Iphigenia was forced to resort to slowly warping towards the mouth of the channel in the hope of escaping the approaching French reinforcements. Boats had removed the crews of Sirius and Magicienne to Île de la Passe, where the fortifications had been strengthened, but supplies were running low and Magicienne's launch was sent to Île Bourbon to request urgent reinforcement and resupply from Rowley's remaining squadron. On the morning of 27 August, Lambert discovered the brig Entreprenant off the harbour mouth and three French sail approaching in the distance. Iphigenia was still three quarters of a mile from Île de Passe at the edge of the lagoon and was low on shot and unable to manoeuvre in the calm weather without anchors. Recognising that resistance under such conditions against an overwhelming force was futile, Lambert negotiated with Hamelin, offering to surrender Île de la Passe if Iphigenia and the men on the island were given permission to sail to Île Bourbon unmolested.