and understood it was possible to use bombers for strategic purposes. He told OKL in 1939 that ruthless employment of the Luftwaffe against the heart of the British will to resist would follow when the moment was right. Hitler quickly developed scepticism toward strategic bombing, confirmed by the results of the Blitz. He frequently complained of the Luftwaffe's inability to damage industries sufficiently, saying, "The munitions industry cannot be impeded effectively by air raids ... usually, the prescribed targets are not hit". While the war was being planned, Hitler never insisted upon the Luftwaffe planning a strategic bombing campaign and did not even give ample warning to the air staff that war with Britain or even Russia was a possibility. The amount of firm operational and tactical preparation for a bombing campaign was minimal, largely because of the failure by Hitler as supreme commander to insist upon such a commitment. Ultimately, Hitler was trapped within his own vision of bombing as a terror weapon, formed in the 1930s when he threatened smaller nations into accepting German rule rather than submit to air bombardment. This had important implications. It showed the extent to which Hitler mistook Allied strategy for one of morale breaking instead of one of economic warfare, with the collapse of morale as a bonus. Hitler was much more attracted to the political aspects of bombing. As the mere threat of it had produced diplomatic results in the 1930s, he expected that the threat of German retaliation would persuade the Allies to adopt a policy of moderation and not to begin a policy of unrestricted bombing. His hope was—for reasons of political prestige within Germany itself—that the German population would be protected from the Allied bombings. When this proved impossible, he began to fear that popular feeling would turn against his regime, and he redoubled efforts to mount a similar "terror offensive" against Britain in order to produce a stalemate in which both sides would hesitate to use bombing at all. A major problem in the managing of the Luftwaffe was Göring. Hitler believed the Luftwaffe was "the most effective strategic weapon", and in reply to repeated requests from the Kriegsmarine for control over naval aircraft insisted, "We should never have been able to hold our own in this war if we had not had an undivided Luftwaffe." Such principles made it much harder to integrate the air force