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"As the Union armies pushed further into Confederate territory, they came into possession of former Confederate railway lines, or what was left of them. Confederate troops generally applied a scorched-earth policy towards railroads when they were in retreat.[1] Union troops would often have to rebuild an entire line from scratch for it to be usable.[1] Late in 1862, when Confederate forces devastated the Mississippi Central Railroad, the Union invasion came to an end.[2] Grant later resumed the attack, pursuing the Vicksburg Campaign along the river, where steamboats could bring supplies.
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