Boris III of Bulgaria
Richthofen moved his units into Bulgaria via Romania. He found the country primitive, and resolved to improve the infrastructure, particularly communications, for the invasion of Yugoslavia. He intended to operate 120 aircraft from Bulgarian airfields and moved them into place on 1 March. While preparations were taking place he indulged in hunting and horse riding expeditions as a guest of the Bulgarian Royal Family. With Boris III of Bulgaria, he discussed dive-bombing techniques and the Corps' new aircraft, such as the Junkers Ju 88.