What If?

POW! Calvary take the east, Soldiers take the west and you send an army north of Gettysburg. After a day of fighting, you've successfully taken over Gettysburg! But your not finished. US Reinforcements are coming.
"Be ready!" you tell your soldiers.
On July 2nd in the middle of the night, Union soldiers arrive. "AHHH" you hear waking you up in a startle. Rushing to grab your rifle you walk outside your tent. Soldiers fighting soldiers.

You have 1 choice: