For this reason, Henlein assumed a major role in Hitler's plans for aggression against Czechoslovakia. On 21 April 1938, Hitler told General Wilhelm Keital of the OKW of the "political preconditions" for a war against Czechoslovakia, stating to avoid a "hostile world opinion which might lead to a critical situation", what was needed was a period of crisis of acute diplomatic tension and "incidents" in the Sudetenland in which Czechoslovakia was to be cast as the aggressor. Once world opinion was turned against Czechoslovakia, which would lead to Britain pressuring France to abandon the alliance with Czechoslovakia, a major "incident" was to occur with the "expendable" Baron Ernst von Eisenlohr, the German minister in Prague, to be assassinated, which then lead to Germany attacking Czechoslovakia. For this reason, it was imperative that Henlein wage a public relations campaign presenting the Sudetenlanders as victimized by Prague to win over public opinion abroad to create a political preconditions for a localized war in Central Europe that would be limited only to Czechoslovakia. Through it was only on 28 May 1938 that Hitler issued the orders for "Fall Grun" (Case Green), the invasion of Czechoslovakia, scheduled for 1 October 1938, the general tenor of his remarks in private together with the direction of his diplomacy suggested he was seriously contemplating invading Czechoslovakia from March 1938 onward.