[citation needed] He was 24 years old and an acting company sergeant major in the 15th Battalion, Lancashire Fusiliers, British Army during the First World War when he performed the deeds which resulted in the award of the Victoria Cross.

For most conspicuous bravery and initiative during the attack at Happegarbes on 2 November 1918, when in command of a platoon, he led his men forward with great determination, and, on being held up by heavy machine-gun fire, rushed forward through a thick, strongly held ridge, captured in succession four machine guns, and single-handed bayonetted the crews.

In the later stages of the attack on the same day, when his platoon was held up by enemy machine guns, he successfully led a Tank against them over very exposed ground.

Continuing the attack on 3rd November, after capturing many prisoners and gaining his objective, he organised his line most skilfully and held up the enemy.

Clarke acted with magnificent bravery and total disregard of personal safety, and by his gallantry and high sense of duty set an inspiring example to all ranks.