[1] 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.

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.

In the early morning the enemy made a determined counter attack on the centre of the newly captured trench held by Lieutenant Tubb.

Supported by strong bombing parties, the enemy succeeded in twice again blowing in the barricade, but on each occasion Lieutenant Tubb, although wounded in the head and arm, held his ground with the greatest coolness and rebuilt it, and finally succeeded in maintaining his position under very heavy bomb fire.On 27 March 1916, the Honolulu Star-Bulletin published a story that Tubb was one of four Australians who survived from a regiment of 1128 men wiped out on the "bloody slopes of Anzac Cove in the Dardanelles campaign.

In that action, Major Tubb was serving with 7th Battalion, 2nd Brigade, 1st Australian Division when he was shot by a German sniper during the Battle of the Menin Road Ridge.