By September 1915 it was clear that the Gallipoli expedition could not succeed. All summer the hopeless struggle had continued for the heights of the peninsula. In July reinforcements arrived, and in August these new divisions, together with the Anzacs,[#] made an attack, that of the left wing at Suvla Bay being designed to turn the enemy flank. This supreme effort failed. There was no chance of further reserves, for the entry of Bulgaria into the war meant that the Allies must send troops to Salonika to help Serbia if possible, and in any case to protect the northern frontier of Greece. Only one course was possible—to get off the peninsula as best we could. [#] So called from the initial letters of the first Australasian Corps—"Australian and New Zealand Army Corps." After much discussion it was decided to evacuate the positions at Suvla and Anzac, and to retain those at Cape Helles. Nearly everybody concerned in the matter assumed that this would entail a heavy loss. Many estimated it at 15 per cent., and the most hopeful were prepared for the loss of at least one division. An embarkation in the face of the enemy had always meant a stiff rearguard fight and many casualties. On the 8th December Sir Charles Monro, who was then in command of the British troops in the Ægean, issued orders for evacuation. The difficulties were enormous. It was a question of embarking not a division or two, but three army corps; it was impossible to move them all at once with the available transports; there must be a gap between the operations, and this meant that the enemy would probably be forewarned of the later movements. Moreover, a lengthy embarkation put us terribly at the mercy of the winter weather. Even a mild wind from the south or south-west raised a swell that made communication with the beaches precarious. The plan was to move the war material, including the heavy guns, by instalments during a period of ten days, working only at night. A large portion of the troops would also be got off during these days, certain picked battalions being left to the last. Everything was to be kept normal during the daylight, and every morning before daybreak the results of the night’s work must be hidden. Success depended upon two things mainly—fine weather and secrecy.