AH Challenge...Keep Mobility in World War I Land Fighting Without the Tank

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?
 
The Germans had sort of caught on to some of the ideas earlier before the war (in terms of motorizing their guns (the 305mm mobile howitzer was transported in three trucks and could be assembled on site)

The doctine was essentially there (fire conquers infantry occupies) but the Germans just didn't have the money to completely finish their next stage of army modernization, conscript a huge army (in fact they inducted less than 60 percent of elidgable males before the war whereas France was closer to 85) and build a massive battlefleet to challange British rule of the sea

Since the Germans allready had some of the ideas down they would be the most likely to reach that stage given that the national priorities of the other players where nowhere near as close to that in 1914. You would need some sort of POD that eliminates German capital ship construction... maybe Willie dies and his son takes over or a quick recession cancels a lot of projects without devastating the economy long term... these resources then need to be xferred to the army
 
I don't think it's possible to keep up the 1914 style movement for much longer than OTL. An array of factors such as force/space ratio and technological development will mean trenches at some point, if not necessarily in OTL positions.
 
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