Two sketches on one sheet relating to the Zeebrugge raid of 23 April 1918, the top one inscribed by the artist, as title. This shows one of the 7.5-inch inch howitzers and a battery of Stokes mortars on the port side of the boat deck of the 'Vindictive' prior to the raid. The seamen appear to be practising their firing drill. Note the differing elevations of the Stokes mortars and that some of the men are wearing 'battle bowlers' (tin helmets). The lower image is a sketch made from a well-known aerial reconnaissance photograph of the mole at Zeebrugge, with ships lying inside it, taken by a seaplane on 22 April 1918.