Background Story
Steve Gwa, a native American serving in U.S. special forces, one day wakes up to find himself in a very unlikely place. He is laying on the ground, near a village that appears to belong to some Mayan tribe in Mexico. He is extremely surprised but as he meets people coming out of huts and sees their skin color and facial structure, he remembers they are somehow familiar. More strangely, he is not wearing his shorts and vest that he wore last night, but instead is wearing a deerskin loincloth only ... just like other people.
In a few days he gradually recalls that all his life (he is 28 years old) in 21st century USA was a dream. A very long, very elaborate dream. His real name is Mumbini and he is a member of one of the Blackfoot Tribes. For several weeks he is unable to adjust to his wakeful normal life, always thinking whether all his life as a US spec ops member was a dream or a reality. He is exceptionally good with the use of tomahawk and empty hand combat where he uses the skills he learned in US armed forces training, but his fellows tell him that he was always good with these and that he was trained by his father, who was a renowned combatant.
Mumbini continues his life perplexedly, recalling bits and pieces of his life as a Blackfoot young man as days pass, but he just cannot shake away the thought of his life as a spec ops agent. He wants to know if history would continue as he had seen and lived it. What keeps bugging him is that he cannot find out what time of history he is living in. One day a group of other Indians, living on the shores, bring fish for barter to his tribe and then he learns that a strange large boat (ship) containing strange paleface men had landed on their shores 4 months ago. A little inquisitive questioning reveals (to him) that the incoming party was none other than Christopher Columbus!
He is feverishly excited by the news. Now is his chance to save his peoples from falling to the European invasion!
Question
Native Indian tribes are separated and are located far off. They are also divided into alliances and hostilities. How can Steve (Mumbini) unite them together against this overwhelming enemy? For a start, how can he convince them all not to partake in any friendly dealings with the newcomers and form an allied war party to immediately dispense of any and all invaders who land on their shores?
Edit to add: Eow means Edge of the World