3 fleet and on small battle units. The present operational strength of the U-boat fleet is estimated at 200, rising possibly to 260 in April and 370 in August, including both the large and small types of prefabricated U-boat, but without any allowance for casualties, or further delays owing to mechanical defects. With one or two exceptions, there is no reason to suppose that U-boats have failed to show a determined spirit while on patrol. Germany's Overall Strategy. 13. Though most Germans must be convinced of the hopelessness of continuing the struggle, Hitler has probably not yet abandoned all hope of turning the tide.