He participated in raids.

He saw the consequences of American expansion firsthand: burned villages, displaced families, the destruction of the world the Shawnee had built in the Ohio country.

He developed, early, the qualities that would define his leadership: physical courage, strategic intelligence, an exceptional capacity for oratory, and a set of core principles about land and sovereignty that he would never abandon.

He also developed, unusual among the warriors of his era, a reputation for the treatment of prisoners.

In an era when the torture and killing of prisoners was common practice on both sides of the border warfare, Tecumseh was known for refusing to allow the torture of captives.