 Complete the following phrase:  In Directive No. 16  On preparations for a landing operation against England on 16 July, Hitler required readiness by mid-August for the possibility of an invasion he called Operation Sea Lion, unless the British agreed to negotiations. The Luftwaffe reported that it would be ready to launch its major attack early in August. The Kriegsmarine Commander-in-Chief, Grand Admiral Erich Raeder, continued to highlight the impracticality of these plans and said sea invasion could not take place before early 1941. Hitler now argued that Britain was holding out in hope of assistance from Russia, and the 