Upon arrival, Chauvel's brigade was assigned to hold part of the defensive line that the Allies had established around Anzac Cove. During this time, they undertook patrolling operations, occupied outposts, carried out sniping and worked to dig trenches and lay down wire. For the majority of the campaign the brigade's regiments maintained a defensive posture; however, in August the Allies attempted to break the deadlock on the Gallipoli peninsula, launching the August Offensive in an effort to secure the heights around Sari Bair, Chunuk Bair and Baby 700. During this effort, the 1st Light Horse Regiment carried out a feint attack at Pope's Hill, in support of the attack at the Nek. Out of 200 men committed, less than 40 survived. Meanwhile, the 2nd Light Horse Regiment undertook its own attack around Quinn's Post; this too met little success and was called off after the first wave of attackers suffered many casualties. Meanwhile, the 3rd Light Horse Regiment was held back in reserve. Following the failed offensive, the brigade occupied positions around the top of Monash Valley, which remained strongly contested. As winter approached, in early September, they were moved to a more secure location on the seaward side, to the north of Anzac Cove, towards Suvla Bay; this position included outposts at Destroyer Hill and Sazli Dere, which had been captured in late August during the Battle of Hill 60. By mid-December all three regiments were withdrawn from the peninsula, as part of the general withdrawal that followed the decision to abandon the position. The 3rd Light Horse Regiment was the first to depart, leaving on 14 December; it was followed by the 2nd on 18 December, while the 1st remained until 21 December, which was the last day. They were subsequently returned to Egypt, sailing via Mudros.