Quinn's Post was the most advanced post of the ANZAC line. Located on the northern edge of the main ANZAC line, along with Pope's Hill, it was one of the keys to the Monash and Shrapnel valleys. If it had fallen the Turks could have broken into the heart of the ANZAC position.
Quinn's Post was first formed in the days following the 25 April landing by small parties of several Australian and New Zealand units, and later British Royal Marines. It was named after Major Hugh Quinn of the 15th Battalion, who was killed leading a charge against Turks who had gained a foothold in the Post on 29 May. For the campaign's first two months Quinn's was mainly garrisoned by the 13th, 15th and 16th Battalions and then the 1st Light Horse Brigade. In June 1915 the New Zealand Infantry Brigade replaced them, and from September it was held exclusively by the 17th Battalion.
Quinn's was the scene of some of the most dramatic events in the Gallipoli campaign. They included the Turkish attacks in April and May, particularly 19 and 29 May, the 24 May truce, and a series of attacks in May and June, Charles Bean described the holding of Quinn's as among the Australian Imperial Force finest feats.