On 2 March Major McCallum DSO of 21st Entrenching Bat. appointed command of 15th R I Rifles; on % March Major McCallum o/c 1st Batt. in line
#draft 3 officers and 120 men from 23rd Entrenching Btn. 3 officers and 340 men from 21st Entrenching Btn. 2nd Apr 1918.