On Sunday 18 June 1944, during morning service, The Guards Chapel was hit by a flying bomb. which killed 121 people. The entire building was destroyed except for the apse (the piece of the building over the altar).
There was a memorial to Captain Barton which was destroyed, with the following inscription
ROBERT JOHNSTON BARTON, Lieutenant and Captain Coldstream Guards, born 1849, younest son of Thomas Johnston Barton, Glendalough, Co Wicklow. Killed 28th March 1879, in the attempt to save the life of a wounded brother officer, near Zlobani Mountain, in Zululand. "Post Tenebras Lux"