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The armored spearhead analogy is twofold.
*Sources and Further Information*
Frieser, Karl-Heinz: The Blitzkrieg Legend
Frieser, Karl-Heinz: Die deutschen Blitzkriege; in: Wehrmacht: Mythos & Realität. (p. 184)
https://en.wikipedia.org/wiki/Karl-Heinz_Frieser
