[1][2] Colyer-Fergusson was 21 years old, and an acting captain in the 2nd Battalion, The Northamptonshire Regiment, British Army when performed the deed on 31 July 1917 during the Battle of Pilckem Ridge at Bellewaarde, Belgium which earned him the Victoria Cross.

The tactical situation having developed contrary to expectation, it was not possible for his company to adhere to the original plan of deployments, and owing to the difficulties of the ground and to enemy wire, Captain Colyer Fergusson found himself with a Sergeant and five men only.

During this operation, assisted by his Orderly only, he attacked and captured an enemy machine gun and turned it on the assailants, many of whom were killed and a large number driven into the hands of an adjoining British unit.

The conduct of this officer throughout forms an amazing record of dash, gallantry and skill, for which no reward can be too great, having regard to the importance of the position won.

This gallant officer was shortly afterwards killed by a sniper.His Victoria Cross is part of the collection at the Museum of The Northamptonshire Regiment (48th & 58th Foot),[5] Northampton, England and he is buried in Menin Road South Military Commonwealth War Graves Commission Cemetery.