Tattnall's gunboats still commanded the lower river around Point Venus. As a part of Lee's active defense, the Confederate's Savannah River Squadron launched continuous patrols. Their naval gunnery required the work along the river by Union besiegers to be done at night. The Federal's guns had to be pulled by hand through swamp over moveable tram sections, the men working in brackish alligator-infested marsh, sinking in over their waist most of the day. The artillery then had to be placed on board-and-bag platforms to avoid their loss by sinking into the morass. The soldiers rested during the day.