Fall Grün ("Case Green") was a pre-World War II German plan for an aggressive war against Czechoslovakia. The plan was first drafted late in 1937, then revised as the military situation and requirements changed. The ultimate revision of the plan scheduled the attack for September 28, 1938; but, as France and the United Kingdom were reluctant to go to war for the sake of Czechoslovakia and expressed political will to avoid such a war at all costs, the execution of the plan was postponed, then, after the Munich Conference (also called the Treaty of Munich) held on September 30, 1938, abandoned altogether.