He was evacuated and did not rejoin his regiment until 1 July. When Brigadier General Chauvel took over the New Zealand and Australian Division on 19 September, Cox became acting commander of the 1st Light Horse Brigade.
He was evacuated first and did not return to his regiment until 1 July. When Brigadier General Chauvel succeeded in commanding the New Zealand and Australian Division from 19 September, Cox acted as the acting commander of the 1st Light Horse Brigade.