Following the loss of Island No. 10 shortly before Farragut took New Orleans, the Confederates had abandoned Memphis, Tennessee, leaving only a small rear guard to conduct a delaying operation. In early June, this was swept aside at the First Battle of Memphis by the gunboats of the Western Gunboat Flotilla (soon thereafter to be transformed into the Mississippi River Squadron) and the United States Ram Fleet, and the Mississippi was open down to Vicksburg. Thus that city became the only point on the river not in Federal hands.