Final answer:
The 20th Maine Regiment was instrumental in winning the Battle of Gettysburg by repelling the Confederate army's attempt to break through the line and charging downhill. Their heroic action led to the surrender of the enemy.
Step-by-step explanation:
The paragraph follows the problem/solution organizational pattern. It presents the problem of the Confederate army trying to break through the line, and then provides the solution or action taken by the 20th Maine Regiment to charge downhill and repel the enemy. This action led to the surrender of the enemy, making the regiment instrumental in winning the Battle of Gettysburg.
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