The USS Monadnock (BM-3) was an iron-hulled, twin-screw monitor of the Amphitrite class, constructed primarily for service in the United States Navy. Laid down on June 23, 1874, in response to the Virginius Incident, her construction was contracted to Phineas Burgess at the Continental Iron Works in Vallejo, California. She was launched on September 19, 1883, and completed at the Mare Island Navy Yard, with commissioning taking place on February 20, 1896. Captain George W. Sumner commanded her during her commissioning, with Lt. Cdr. Edward D. Taussig serving as executive officer. The Monadnock's initial service was as part of the Pacific Squadron along the U.S. West Coast, engaging in exercises and training cruises from Puget Sound to the Baja California peninsula over the following two years. Her role became more prominent during the Spanish–American War, when she was ordered to join Admiral George Dewey’s fleet in the Philippines. She departed San Francisco on June 23, 1898, stopping in Hawaii before arriving at Manila Bay on August 16, 1898. During the war, she participated in combat operations such as the Battle of Caloocan on February 10, 1899, and shelled a city in late February. She maintained blockade duties around Manila, Cavite, and Mariveles, with occasional voyages to Hong Kong. From December 1899 onward, Monadnock operated extensively in Chinese waters, especially along the Yangtze River, to protect American interests and the foreign settlement at Shanghai. She made multiple patrols at the Yangtze River mouth and around Shanghai, serving in these roles until 1904. She remained in the Philippines, based out of Olongapo, with brief visits to Hong Kong, until she was decommissioned at Cavite on March 10, 1909. Recommissioned in 1911, she continued operations, including cruising with submarines and towing targets, until her final decommissioning on March 24, 1919. Her name was struck from the Navy list in 1923, and her hull was sold on August 24, 1923. The USS Monadnock served notably during the Spanish–American War and in protecting American interests across the Pacific and Chinese waters, exemplifying the naval presence of the United States in these strategic regions during that era.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.