(Includes maps) "Cross-Channel Attack" is one of approximately a hundred volumes which the Department of the Army intends to publish regarding its part in World War II. This particular volume deals with the planning and the difficulties encountered incident to the mounting of the largest amphibious assault ever undertaken in military history. Much of the information it contains has not heretofore been a matter of public knowledge. For example, light is for the first time thrown upon the enemy's conflicting theories of defense against Allied air superiority and upon his lack of first-class troops. This information is derived from the official records of the Wehrmacht and from signed statements of German participants. Many of the difficulties encountered in the planning, as well as in the execution stage of the operation, are here described to the public for the first time. Where this history deals with the struggle ashore, it clearly illustrates the necessity for commanders to adjust their thinking to the means at hand, the terrain, and the influence of new weapons. It reiterates the indispensability of constant training in how to get order out of the confusion which is forever present upon the battlefield. It brings to mind in this connection the means used by a football team for meeting the problems of overcoming opposition on the playing field. The plays devised and the techniques used to attain its ends must be practiced again and again. Frequently it is the loss of effective direction of small units, incident to the battle's toll, which makes for failure rather than success.