Dragonfly, Grasshopper and Scorpion were involved in the fighting down the Malay Peninsula and Singapore. United States U.S. Navy craft were of varying age, design, size, and utility. The earliest craft made brief excursions upriver between 1861 and 1901, but were rarely assigned on permanent patrol. In 1901 two large gunboats, USS Helena (1290 tons and crew of 170) and Wilmington (1570 tons and 212), were assigned to the Asiatic Squadron's "Second Division" as permanent river patrol, although too large to patrol deep inland, until 1932 and 1923 respectively. In 1903 converted gunboats of the Spanish Navy captured in 1898, began patrols designed to take them further upriver toward Chungking. USS Elcano, a 620-ton craft with a crew of 103, and USS Villalobos, a 350-ton ship with 50 men, served until 1928, when they were decommissioned and sunk. USS Callao (240 tons) and Quiros (sister ship to Villalobos) served until 1916 and 1923. In 1914 two 204-ton, 50-man patrol craft of British design and built at Mare Island Naval Shipyard were disassembled, shipped to China, and reassembled in Shanghai. USS Palos patrolled until 1934, when she became the station boat at Chungking, and Monocacy until 1939. The Yangtze Patrol was formally established in 1922 as a component of the Asiatic Fleet. Six new craft were designed and built in 1928 in Shanghai, of three differing sizes. USS Guam and Tutuilla, 380 tons and a crew of 60, were able to ply the entire river year round. USS Panay and Oahu, 450 tons and a complement of 65; and Luzon, 560 tons and 82 men, were "May–September" gunboats, able to patrol completely upriver only during high water months. (Luzons sister ship, USS Mindanao served on the China coast but not in the river patrol.) Except for Panay, sunk by Japanese aircraft in December 1937, the newer ships served in China until late 1941. See also USS Cairo The Sand Pebbles - A film based on the book of the same name Paraguayan War Steamboats on the Yangtze River External links 1928 River Gunboats PR-3;PR-4;PR-5;PR-6;PR-7; PR-8 {reference only} The Yangtze Patrol HMS Falcon—a site devoted to British river gunboats that patrolled China. Brazilian Navy official website: Roraima Class gunboats. (in Portuguese) Ship types Riverine warfare Small combat vessel classes