American Indian Military
Revolutionary War (1775-1783)
War of 1812 (1812-1815)
Shawnee in the War of 1812, by Richard Williams, gives a short history of Tecumseh and his brother, Tenskwatawa, The Prophet, who fought with the British and then went to Canada. Most Shawnee remained neutral during the War of 1812.
Civil War (1861 to 1865)
See American Indians in the Civil War for information about American Indian Civil War records, web sites, etc. with links to articles about the American Indian regiments involved in the Civil War.
The regimental pages often include lists of the companies with links to the locations where the companies started. Men in the companies often lived in the locations where the companies were raised. Knowing a location can help when researching more about the soldiers and their families.
The Civil War Soldiers and Sailors System allows name searching for soldiers. The result set gives the regiments for the soldiers. Then you can check the Wiki regiment pages to determine locations. Often knowing the locations that had men in a regiment will help you determine if a soldier was your ancestor.