The Civil War battle resulted in the Union army halting Robert E. Lee's invasion of the north include option B: Gettysburg.
The Battle of Gettysburg was started from July 1 to July 3 of 1863. As the Union were able to force Robert E Lee and the Confederacy to retreat, this battle was considered as a critical in terms of the Civil War.
Moreover, this is refers to as a turning point by many historians due to the fact that the Confederacy never invaded the Union states again after this battle.
Therefore, correct option is B.
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