I won't go into details everyone has heard of Otzi.

His body was discovered by two hikers in 1991 and we thought he was a shepherd that go lost in a snow storm, but with new technologies and discoveries, an update is required.
In 2001 an arrowhead was found in his shoulder, despite to a theory, it didn't kill him because bone have grown so it means he healed and was alive for long enough for the healing. Something else killed him. There are a lot of evidence that he died fighting.
His clothes and weapons contained the blood of fours different persons, his right hand has a cut deep to the strings showing a defensive move, he tried to shield himself with his hand.
So the oldest ice mummy of the world has shown evidence of violence and warfare.