	The fourth Chickasaw Bluff was the site of the French Fort Assumption, used as a base against the Chickasaw in the abortive Campaign of 1739. The Chickasaw Bluff secured Memphis from river floods, while a rare shelf of sandstone below provided a secure boat landing, making this the "only site for a commercial mart" between the Ohio River and Vicksburg, Mississippi. This location was also the meeting place of d'Artaguette, Chicagou and de Vincennes before their ill-fated 1736 attack against the Chickasaw.