 When the First World War broke out in August 1914 , Stewart enlisted in the New Zealand Expeditionary Force ( NZEF ) . He received a commission as a lieutenant and was posted to the Canterbury Battalion , New Zealand Infantry Brigade , which embarked from Wellington in October 1914 for Suez , Egypt . In Egypt , the brigade was combined with an Australian infantry brigade to form the New Zealand and Australian Division , intended for service in the Gallipoli Campaign . 
