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As we all know, the early months of World War One represented a period when mobility was still possible on the battlefield. It was really only after the Battle of the Marne that full-scale trench warfare, and static immobility, began to reign on the various battle fronts as troops were driven underground by massive defensive firepower. How could such a development be prevented?
Your challenge, should you choose to accept it, is to solve this dilemma, with a POD after 1900, WITHOUT an earlier invention of the TANK.
My own suggestion would be an earlier invention of something along the lines of the Hutier Tactics used with great success in the latter portion of WWI. How might that come about? Could the Russo-Japanese War provide a catalyst for something like that?
Assuming a solution can be found to this challenge, what might the effects be?