 In April, while proceeding to Berwick Bay, La., to replace which had been captured there on 28 March, "Sachem" developed serious leaks which forced her to return to New Orleans.After repairs had been completed, the ship returned to Berwick Bay; ascended the Atchafalaya River, bypassing Port Hudson; and joined Farragut in sealing off the mouth of the Red River and in patrolling the Mississippi above Fort Hudson.This blockade stopped the flow of food and supplies to the Southern riverbank forts at Vicksburg and Port Hudson.