12 April, 1918

Marines of the 4th Brigade suffered their first gas attack on the night and early morning hours of 12-13 April when the Germans bombarded the 74th Company, 6th Marines near Verdun with mustard gas. Nine Marine officers and 305 enlisted Marines were gassed and evacuated, and 30 Marines died from the effects of the gas shells which hit in the middle of the reserve area cantonments in which they were sleeping.