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, <answer>Sir John Burgoyne</answer>, 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.
Who was the engineer adviser? 
Sir John Burgoyne