Ostend and Zeebrugge : april 23: May 10, 1918 / The dispatches of Vice-Admiral Sir Roger Keyes and other Narratives of the Operations ; ed. … Despatches from the Vice-Admiral, Dover-Patrol, on Zeebrugge and Ostend operations, 22nd-23rd April, 1918, and Ostend operations, 10th May, 1918