General Ulysses S. Grant changed the Union military strategy by
A. relying minimally on railroads and the telegraph, both of which the Confederate troops could easily disrupt.
B. refusing to order his troops to assault heavily defended positions.
C. advancing all of the Union armies simultaneously, instead of targeting a specific city, place, or territory.
D. reorganizing the army to a level of efficiency comparable to that of the Prussian army.
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