About 1¼ mi. NE, now under water, a redoubt served as the mainland defense headquarters for Island No. 10. It was flanked by Batteries 2, 3, 4 and 5, which commanded the river. After successfully withstanding bombardment for two weeks, these works and the island batteries interdicted the river until USS Carondelet and Pittsburg slipped past in darkness to cover Pope's crossing from New Madrid.