"The first plan for an offensive campaign [in the West] was formulated in November 1939. In substance it was a repetition of the 1914 Schlieffen plan. As the start of the campaign was delayed, doubts arose as to the achievement of any surprise with this plan. The basic idea of the new plan—the breakthrough in the Ardennes, crossing of the Meuse, and the trapping of British, French and Belgian forces in the north by pushing the tank forces through to the Channel—came to several minds at once. And in justice it should be said that one of these was Hitler’s. However, General Manstein, then chief of staff to Marshal Rundstedt, deserves the greater credit. He worked out the plan and proposed its adoption. The order was given to the Operations Division in February 1940 to replan the campaign along the proposed lines. From February 1940 to May 1940 the plan was subject to the sharpest criticism. Among the critics was General Guderian, who described the plan as a ‘crime against Panzers’. General Halder deserves the credit for defending the plan against all critics and insisting upon its execution. General Bock was also opposed to it and appealed to the chief of the general staff. Halder said once that he would stick to the plan if the chances of succeeding were only ten percent."