As quoted in Cavalry from Hoof to Track (2009) by Roman Jarymowycz, Ch. 16 : Cold Warhorse: Pegasus ex Machina
New weapons require new tactics. Never put new wine into old bottles.
Quote text and notes from Wikiquote: Heinz Guderian (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.