Sacs, Or Sauks, an Algonquin tribe of Indians, formerly on the Detroit river and Saginaw bay, but driven beyond Lake Michigan by the Iroquois. They settled near Green bay, where they subsequently welcomed the Outa-gamies or Foxes, with whom they have ever since been closely associated. They were roving and restless, were constantly at war with the Sioux and the Iroquois, and aided the French against the latter. A part of the tribe at first joined the Foxes in their hostility against the French at Detroit, but soon abandoned their cause. They took part with Pon-tiac, and during the revolution were under English influence. In the second war with England the Rock river Sacs joined the English side. Treaties were made specially with the tribe in 1804 and 1815-'16, ceding lands. Their later history is that of the Foxes. (See Foxes.) The Sacs were divided into a great number of clans, the Great and Little Bear, Great and Little Fox, Wolf, Owl, Eagle, Tortoise, and four others. The children of each family as they are born are marked white or black alternately, and each color forms a distinct band in the nation, the white or Kis-coquah and the black or Oshkosh. When Black Hawk with the British band of Sacs began war in 1832 to recover the ceded lands on Rock river, Keokuk, chief of the Kiscoquah band, a great warrior and negotiator, remained faithful.

The united Sacs and Foxes numbered 8,000 in 1822, but were reduced in 1874 to 1,135, of whom 338 were in Iowa, 97 in the Great Nemaha agency, Nebraska, 200 in Kansas, and 500 in Indian territory.