 Jeschonnek did not help and refused to concede Heinkel He 111, Dornier Do 17, or the Dornier Do 217, then under development, to naval operations.Despite Jeschonnek's lack of cooperation in the war at sea, he was approached by "Großadmiral" Erich Raeder, commander-in-chief of the "Kriegsmarine" (Navy) to assist in planning the invasions of Denmark and Norway, Operation "Weserübung".A directive for the invasion was published on 1 March 1940.