In 1862 union soldiers obtaining blank spoiled lees invasion of pennsylvania

They revealed that Lee's widely separated divisions might be destroyed piecemeal. McClellan did not move fast enough to achieve this. But it forced Lee to fight on a field that was not of his choosing and his campaign was off the rails.

1) union forces launched a surprise attack.

2) more confederate troops arrived by train.

3) union forces retreated.

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