Believing the northern approaches to the city too well defended, especially due to the presence of a large star fort and because Sevastopol was on the south side of the inlet from the sea that made the harbour, Sir John Burgoyne, the engineer advisor, recommended that the allies attack Sevastopol from the south. This was agreed by the joint commanders, Raglan and St Arnaud.:426 On 25 September the whole army marched southeast and encircled the city to the south. This let them set up a new supply center in a number of protected inlets on the south coast. The Russians retreated into the city.