The resulting outcry across the United States led to a number of antiwar demonstrations—it was at one of these demonstrations that the National Guard shot four protesters at Kent State.
I'm pretty sure only 1 or maybe 2 years.
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What made it so hard for them to fight? well it was the raw temperature out on the battle field at a constant level and it also costed a lot of Russian life's also
In WW1 soldiers faced a lot of threats in the trenches , the worst would be disease