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A 1914 "Germans go east" is a popular time line here. Assuming that the Germans had been planning to go east for years by 1914 (no attack in the west was ever considered). Would the German army be weaponed differently?
1) Would you have more cavalry?
2) More light infantry divisions?
3) More armored trains?
4) Less artillery in General (or maybe more heavy for the various fortresses)?
5) Gunboats transportable by rail for Eastern rivers and lakes developed
6) Barges developed for supply/transport invasion in the Baltic and or rivers.
7) A bunch of engineers capable of deploying light rail in a hurry?