Wherever the Union armies went in the South (after the Emancipation Proclamation), they were under orders to liberate any slaves they found.
These (ex) slaves followed the armies back North and were given menial jobs in the camps. Presently some were allowed in uniform.
Although the "liberators" did free many slaves on their march, it would be a disservice not to mention both sides of this.
Some slaves were murdered by the Federal troops, and many of the women were raped by their liberators. Many followed the Union troops, and fell ill or starved. Often, slaves would flee into the woods when the Yankee armies approached, knowing that in some cases the men would be taken to perform menial tasks, such as grave and trench digging.
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The slaves headed to the union so which was in the north.
African Americans fought both on the front lines as soldiers and behind the scenes as labor workers. Former slaves played an important role in the North's victory.
To reunite the Union. He even offered to let them keep their slaves if they rejoined by a certain date.
The South. The only slaves in the Union were in the four Border States of the Upper South (Kentucky, Missouri, Maryland, Delaware), where there was less pro-slavery sentiment than in the Deep South. But of course it was the North that received a constant influx of liberated slaves, who were eventually absorbed into the Union armies.
The North won the civil war, which meant that the South had to rejoin the union and free their slaves.