The sacs or Sauks were a North American Indian tribe forming a branch of the Algonquin family. They were originally based on the upper St Lawrence. They were driven beyond Lake Michigan by the Iroquois and settled near Green Bay, where they subsequently joined with the Foxes. They aided Pontiac, and during the American Revolution supported the English. In 1812, the Rock River Sacs aided Great Britain. In 1804 and 1816 they ceded lands. Their later history is that of the Foxes. Research Sacs