| Annotated vertical aerial photograph taken during a 'Circus' operation by a combined force of Bristol Blenheim Mark IVs drawn from Nos. 21, 105 and 110 Squadrons RAF, which attacked the Etabs. Kuhlmann chemical factory at Choques, France. Bombs can be seen exploding on, the power house ('1'), the chemical works ('2'), the railway sidings and rolling stock ('3'), and other buildings believed to be the benzol and by-products plants ('4'). |