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What did Blitzkrieg rely on for success?
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Tanks, mobile artillery, and aircraft. In the first Blitzkrieg against Poland in 1939, German attacks always avoided strong resistance in order to sustain the momentum of an assault, which concentrated upon rear areas to break lines of supply and communication. Once this was achieved, less-mobile forces could annihilate isolated pockets of resistance. The Blitzkrieg doctrine not only required new technology, it also needed commanders with the tactical vision and flexibility to fully exploit opportunities and overcome obstacles in order to sustain an attack’s momentum.