steamer USS Hatteras approaching, the Confederate vessels withdrew to Lake Pontchartrain and the Union forces moved on to Pass Christian. The 1,200 troops aboard Henry Lewis landed, and the area was captured. With Union forces preparing to attack New Orleans, Oregon, Pamlico, Carondelet, Arrow, and the gunboat CSS Bienville remained at Lake Pontchartrian, guarding Chef Menteur Pass and the Rigolets. On April 24, Union Navy forces under Flag Officer David Glasgow Farragut pushed passed the Confederate defenses at Fort Jackson and Fort St. Philip, and then moved past the defenses at Chalmette, Louisiana, the next day. New Orleans was largely indefensible after the fall of those positions, and Oregon was sunk as a blockship. Naval historian Neil P. Chatelain states that she was sunk in the Rigolets between Lake Pontchartrain and Lake Borgne, while historian W. Craig Gaines places the sinking in either the Tchefuncte River or the Bogue Falaya River. The wreck later interfered with the escape of other Confederate vessels from Lake Pontchartrain, and remained there until a contractor for the United States Army Corps of Engineers removed it between 1872 and 1873. Any iron debris was removed by the contractor, while the rest of the wreck was burned on shore. References Sources Gunboats of the Confederate States Navy Ships built in New York City Shipwrecks of the American Civil War 1846 ships Maritime incidents in April 1862 Scuttled vessels