The son of Lady and the late Sir Allan Mackenzie Bart. of Glen Muick, Aberdeenshire, Mackenzie was killed at the Somme on 16 September 1916 leading his company near Ginchy. He is buried at Corbie Communal Cemetery.*
Ponsonby writes of the 3rd Battalion Grenadier Guards “Almost at the outset Captain A. K. Mackenzie was hit and fell, as he led his company to the attack. Though mortally wounded, he got up again and struggled on, still waving his men forward. Once more he fell, and this time was unable to rise, but even then he managed to raise himself on one knee and cheer the company on. Afterwards he was carried down on a stretcher, but never recovered and died in the ambulance on the way.”
Sources: The Grenadier Guards in the Great War 1914-1918 Vol 2. Sir Frederick Ponsonby
* Corbie Communal Cemetery Extension, Plot 2, Row D, Grave 55.