He was 33 years old, and a lieutenant in the 7th Battalion, Australian Imperial Force, during the First World War when he was awarded the VC for his actions on 9 August 1915 at Lone Pine, Gallipoli. Lieutenant Tubb held a newly captured trench which was being counter-attacked by the enemy, who blew in a sand-bag barricade, leaving only a foot of it standing. Tubb led his men back, repulsed the enemy and rebuilt the barricade. Twice more the enemy blew in the barricade, but on each occasion this officer, although wounded in the head and arm, held his ground and assisted by corporals Alexander Burton and William Dunstan, rebuilt it, and maintained the position under heavy bombardment.