 On May 15, 1862, the Regiment, minus those at Fort Pike, sailed on the "Iberville" to Baton Rouge.On June 19, 1862, eight companies boarded the steamers "Ceres" and "Morning Light" for the ill-conceived and under-manned expedition to lay siege to Vicksburg, Mississippi, arriving near Vicksburg on the 25th.The Siege of Vicksburg was abandoned on July 24, and the Regiment returned to Baton Rouge on July 26, with 100 of the 800 men who went up the river still fit for duty.