The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
The two different accounts of Constantine's famous battle at the Milvian Bridge were the following. He won the battle and as the angel promised in his dream, so Constantine converted into Christianism. And with this victory, he became the only and absolute ruler of the Roman Empire.
The battle at the Milvian Bridge was fought on October 28, 312. It confronted Constantine's troops against Maxentius' troops, the other Roman ruler. The battle was held at Milvian Bridgen, right over the Tiber River in Rome.
