Final answer:
The Battle of Gettysburg did not cause the least amount of casualties during the Civil War. It remains the biggest and costliest battle ever fought in North America.
Step-by-step explanation:
The Battle of Gettysburg, which took place from July 1-3, 1863, did not cause the least amount of casualties during the Civil War. In fact, it remains the biggest and costliest battle ever fought in North America. Approximately 23,000 Union soldiers and 28,000 Confederate soldiers were casualties of the battle, bringing the total casualties to around 51,000. The battle had a significant impact on the outcome of the war, marking a turning point in favor of the Union.