The Gallipoli Campaign had raged on two fronts, Anzac and Helles, for three months since the invasion of 25 April 1915. With the Anzac landing a tense stalemate, the Allies had attempted to carry the offensive on the Helles battlefield at enormous cost for little gain. In August, the British command proposed a new operation to reinvigorate the campaign by capturing the Sari Bair ridge, the high ground that dominated the middle of the peninsula above the Anzac landing.