British war planning had called for a "knockout blow" by strategic bombing of German industry with the RAF's substantial Bomber Command. However, there was considerable apprehension about German retaliation, and when President Franklin D. Roosevelt proposed an agreement not to mount any bombing raids which might endanger civilians, Britain and France immediately agreed and Germany two weeks later. The RAF therefore conducted a large number of combined reconnaissance and propaganda leaflet flights over Germany. These operations were jokingly termed "Pamphlet raids" or "Confetti War" in the British press.