Birks' unit was incorporated into the Mediterranean Expeditionary Force and was sent into action at the landing at Anzac Cove, providing medical support for the 2nd Infantry Brigade. The 2nd Brigade were also sent to Cape Helles, where they assisted in the attack on Krithia. During the battle, Birks was carrying wounded under heavy shell and rifle fire, in areas where stretchers were unable to reach. His "devotion to duty and good work" earned him his first Military Medal recommendation. On 26 June 1915, Birks was wounded by shrapnel but returned to service the next day, remaining on Gallipoli until 9 September.