The Battle of Gettysburg was unusual compared to other battles in the East because Lee suffered a major defeat, and was invading the Union.
Option B and D are correct.
Why the battle of Gettysburg is important?
The Battle of Gettysburg was significant because it resulted in the Union's eventual triumph, giving the North a massive morale boost and putting an end to Confederate General Robert E. Lee's daring plan to invade the North.
In the battle of Gettysburg, Lee suffered a major defeat due to the counterattacked of the general Grant's forces, and he was also invading the Union, in June 1863.
Therefore, options B and D are correct.
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