History Shorts: The Battle of Milvian Bridge (312 A.D.)

Diocletian’s tetrachy disintegrated after his death. Constantine and others vied for control of the Roman Empire. The Civil War raged until Constantine defeated his final rival at Milvian Bridge. Prior to the engagement, Constantine saw something in the sky, which he interpreted as a sign from the Christian God. He placed the Christian symbol on his men’s shields and went into combat. Following his victory, Constantine credited his victory to the Christian god and legalized the religion.

Here is a dramatization of events:
http://www.youtube.com/watch?v=4_P0FZfPlSA