The gladiator battles consisted of two competitors fighting to the death. They fought with swords and shields. When the first one to kill the other claims victory. In the wild animal battles, a human and an animal would fight. The gladiator would have to kill the animal before it kills him. Many times, the animal in the fight was a lion or other ferocious animals.
The Colosseum was up and running for four centuries until it was abandoned completely. The arena was damaged by lightning, earthquakes, and other acts of nature. Once nobody used the building anymore it was used for many building projects. The Amphitheater was used as recreation for the Cathedrals of St. Peter and the St. John Lateran. When there was a war they had also used the Colosseum's remains for a defense.