Throughout the game, you can visit Fort Condor to engage in some battles; but not in the way we are used to.
These battles are more real-time strategy where you place units on the side of the hill and your goal is to prevent the enemy from reaching the top.
To do this, you must place units on the hill that you can command to move and attack the enmy or set up as a defence.
There are 21 battles in total; including the story one to obtain the Huge Materia but there are some that cannot be fought as they occur during events that cannot be skipped in the story.