Constantines army were amazed, as it was confirmed that it was Christ that they were dealing with. In the morning Constantine and his army adopted the sign and painted it on banners, their armor and shields.
No way. Really? Christ came to you in your dream?
Constantine and his army against all odds beat Maxminius and his army on Milvian Bridge. Constantine believed that it was God that lead them to victory and from then on considered himself a christian. (even though he wasn't baptized till 1337)
Due to their victory and Constantines conversion, Constantine and the emperor of Eastern Rome (Licinius) issued the policy, "Edict of Mulan". This policy entitled complete freedom when it came to Religion. Later under Emperor Theodosius Christianity became the official Religion of the Roman Empire.