Tribes allied with both sides during the war.
Though most of the tribes were siding with the French, the British were able to get some tribes to fight on their side.
The French-Indian war began as American colonists were encroaching on French land. The French fought with the Huron, long time friends of the French. The Iroquois joined the British due their feelings toward the Huron who were long time enemies of the Iroquois.