As a second lieutenant Hugo Throssell fought at Gallipoli, where he had landed on 4 August. He saw action in the desperate Battle of the Nek. According to the Australian Dictionary of Biography:
Captain Hugo Throssell c.1918
This experience increased his eagerness to prove himself in battle. He wanted to avenge the 10th L.H.R. which, like so many of the Anzac troops, was battle-worn, sick and depleted. His chance came later that month at Hill 60 during a postponed attempt by British and Anzac troops to widen the strip of foreshore between the two bridgeheads at Anzac and Suvla by capturing the hills near Anafarta. Hill 60, a low knoll, lay about half a mile (0.8 km) from the beach. Hampered by confusion and lack of communication between the various flanks, the battle had been raging for a week with heavy losses.
A few weeks later, he fought at Hill 60:
On 29–30 August 1915 at Kaiakij Aghala (Hill 60), Gallipoli, Turkey, Second Lieutenant Throssell, although severely wounded in several places, refused to leave his post during a counter-attack or to obtain medical assistance until all danger was passed, when he had his wounds dressed and returned to the firing line until ordered out of action by the Medical Officer. By his personal courage and example he kept up the spirits of his party and was largely instrumental in saving the situation at a critical period