Conner that the river was rising and that the town had been abandoned. Conner's forces crossed the bar on 14 November and began shelling the town. Almost immediately the remaining garrison at Tampico surrendered and Conner learned that the troops stationed there had retreated to Pánuco 25 miles upstream from Tampico. After Conner's ships moved to Pánuco and several days of naval bombardment, the Mexican forces at Pánuco surrendered. The American Army quickly occupied Tampico and used it for a staging point for a planned attack on Veracruz. American Civil War The U.S. Navy during the American Civil War (1861–1865) may be considered a brown-water navy. As a blueprint for the "strangulation" of the Confederate States of America, Winfield Scott's Anaconda Plan called for a two-pronged approach by first blocking the South's harbors and then pushing along the Mississippi River, effectively cutting the Confederate territory in two while also robbing the South of its main artery of transport. The U.S. Navy was assigned the blockade of the seaports, while a new force of gunboats and river ironclads, together with regular army units, would take, or at least lay siege to, the Confederate forts and cities along the Mississippi. In the early days of the war, U.S. Army built and crewed these boats, with the naval officers commanding them being the only direct connection to the U.S. Navy. By the autumn of 1862, the boats and their mission were transferred to the Department of the Navy. Because of the river's murky brown water, the ships that participated in these Mississippi campaigns were quickly referred to as the brown-water navy, as opposed to the regular U.S. Navy (which was henceforth referred to as the deep-water or blue-water navy). Paraguayan War After the end of the American civil war the next major military conflict in the world was the Paraguayan War (1864–1870). In this the Brazilian brown-water navy, which comprised large ironclads as well as river monitors, had a crucial role. The natural water highway to the Republic of Paraguay was the River Paraguay but this route was blocked by the formidable Fortress of Humaitá. It comprised a line of artillery batteries overlooking a sharp concave bend in the river, at a point where the channel was only wide. A chain boom could be raised to block the navigation. The fortress was exceedingly hard to take from the landward side for it was