'Kruschen' (i) was a British planning and training exercise by Brigadier O. M. Wales’s 163^rd Brigade of Major General E. H. Barber’s (from 14 April Major General C. B. Wainwright’s) 54^th Division to discover the various means by which the German defence could be compelled to fall back from its concrete defences on the coasts of German-occupied Europe (April 1943).