Yorktown-class gunboat

The Yorktown-class ships were 244 feet 5 inches (74.50 m) in length and 36 feet (11 m) abeam. The steel hulls had an average draft of 14 feet (4 m),[1] which was expected to give them the ability to escape from larger ships into shallow water.[2] At the waterline was a turtleback deck of 3⁄8-inch (9.5 mm) steel that formed a watertight seal over the lower spaces. This deck had a crown at the level of the waterline and curved downwards to 3 feet (0.91 m) below the waterline at the sides of the ship. Below this armored deck were twelve compartments separated by watertight bulkheads; the spaces above were equipped with watertight doors intended to be closed during battle.[2]

Above the armored deck, each ship had forecastle and poop decks with an open gun deck that spanned the length of the ship between them. The conning tower was located forward on the forecastle deck and was oval-shaped to deflect shot. It was outfitted with a steam-powered steering wheel, a telegraph, and speaking tubes; it was protected by 2 inches (51 mm) of steel armor plate.[2]

The Yorktown-class ships were powered by two triple-expansion steam engines which each drove one of the pair of 10.5-foot (3.2 m), three-bladed screw propellers. The cylinders of each engine were 22, 31, and 51 inches (56, 79, and 130 cm) in diameter and had a 30-inch (76 cm) stroke.[2] Each engine was rated at 3,400 indicated horsepower (2,500 kW) and as a pair were designed to move the ships at 16 knots (30 km/h),[2] though all three exceeded that speed in trials; Bennington reached a top speed of 17.5 knots (32.4 km/h).[3]

The engines, situated in separate watertight compartments, were each fed by a pair of coal-fired boilers. Each boiler was horizontally mounted and was 9 feet 6 inches (2.90 m) in diameter and 17 feet 6 inches (5.33 m) in length with a total grate area of 220 square inches (1,400 cm²). The coal bunkers of each ship could carry up to 400 long tons (410 t) of the fuel, and were shielded from "shot and shell". At a near top-speed of 16 knots, the ships could cover 2,800 nautical miles (5,200 km) in 6½ days; at the more economical speed of 8 knots (15 km/h) they could cruise 12,000 nautical miles (22,000 km) over 62 days.[2]

To supplement the steam power plant, the ships were built with three masts that were schooner-rigged. They had a total sail area of 6,300 square feet (590 m²). The steam and sail combination was expected to allow the Yorktown-class ships to remain at sea for months at a time during wartime.[2]

The main battery of the Yorktown class consisted of six 6-inch (152 mm)/30 caliber Mark 3 guns,[4][6][Note 1] with each gun weighing in excess of 11,000 pounds (5,000 kg).[6] Two were mounted on the forecastle deck, two on the poop deck, and the other pair amidships on the gun deck. The two guns on the gun deck were mounted 10 feet (3.0 m) above the waterline, while the other four were 18 feet (5.5 m) above.[2] The guns fired 105-pound (48 kg) armor-piercing projectiles with a propellant charge weighing 18.8 pounds (8.5 kg) at 1,950 feet per second (590 m/s). At an elevation of 30.2°, the guns had a range of 18,000 yards (16,000 m).[6] Each gun was shielded with steel plating 3 inches (76 mm) thick.[2]

The secondary battery for Yorktown and Concord consisted of two 6-pounder (57 mm (2.24 in)) guns, two 3-pounder (47 mm, 1.85 in) guns, and two 1-pounder (37 mm, 1.46 in) guns; Bennington was armed with four 6-pounders and four 1-pounders.[1] All were based on designs of the French arms company Hotchkiss.[2] According to a 1902 Bureau of Ordnance publication, an armor-piercing round fired from a 6-pounder gun could penetrate 2 inches (51 mm) of armor at a distance of 1,000 yards (910 m).[7]

After her commissioning, Yorktown (second from left) was a member of the United States Navy's Squadron of Evolution.

Yorktown was laid down by William Cramp & Sons of Philadelphia in May 1887 and launched in April 1888. After her April 1889 commissioning, Yorktown joined the Squadron of Evolution of "New Navy" steel-hulled ships. Detached from that squadron, Yorktown, under the command of Robley D. Evans, sailed to Valparaíso, Chile, during the 1891 Baltimore Crisis and relieved Baltimore at that port. After that situation was resolved, Yorktown took part in the joint British–American sealing patrol in Alaskan waters and served as a station ship before returning to the United States in 1898. Yorktown was out of commission during the Spanish–American War, but took part in actions in the Philippine–American War and the Boxer Rebellion in 1899 and 1900, respectively, after she had been recommissioned.[4]

After three years out of commission from 1903 to 1906, Yorktown hosted Secretary of the Navy Victor H. Metcalf on board when he greeted the Great White Fleet on its arrival in San Francisco in May 1907.[9] Over the next five years, most of Yorktown's time was spent in sealing patrols in Alaska and duty in Latin American ports. From July 1912, Yorktown was out of commission for alterations, but resumed duties off the Mexican, Nicaraguan, and Honduran coasts beginning in April 1913. Through World War I, Yorktown continued in the same role, until she departed for the East Coast of the United States in April 1918. She served an escort for one convoy headed to Halifax, Nova Scotia, Canada, in August, and remained in coastal escort duties in the east until January 1919. After arrival at San Diego in February, she was decommissioned for the final time in June 1919; she was sold in 1921 to an Oakland firm and broken up that same year.[4]

Concord in San Francisco Bay, c. 1890s

The contract to build Concord was awarded to N. F. Palmer & Co. of Chester, Pennsylvania, in the 1888 fiscal year. Her hull was subcontracted to the Delaware River Iron Shipbuilding & Engine Works, which laid down her keel in March 1888. Concord was launched in March 1890. After her 1891 commissioning, Concord spent the next few years sailing along the East Coast of the United States, in the West Indies, and in the Gulf of Mexico. In 1893, Concord cruised on the Asiatic Station and also sailed on the sealing patrol, keeping check on fur seal hunters in Alaska. After another stint in the Far East in 1894, Concord spent a year out of commission at San Francisco from May 1896 to May 1897. After spending most of the rest of 1897 in Alaskan waters, Concord returned to the Asiatic Station in January 1898. She joined Admiral George Dewey's fleet for the 1 May 1898 Battle of Manila Bay, a decisive American victory over the Spanish Fleet in the Spanish–American War. After the battle, Concord supported United States Army operations in the Philippines in the Philippine–American War.[8]

From 1901 to 1909, Concord alternated between Alaskan patrols, cruising the Mexican coast, and periodic trips to China, serving for a time on the Yangtze Patrol. In November 1909, Concord was decommissioned at the Puget Sound Navy Yard. For the next five years, she served as a barracks ship for the Washington Naval Militia. In 1914, the former Concord was transferred to the Public Health Service and served as a quarantine ship at Astoria, Oregon until 1929. After a brief return to Navy custody, the ship was sold in June 1929.[8]

Bennington after her boiler explosion in July 1905 at San Diego

Bennington was awarded to N. F. Palmer & Co. of Chester, Pennsylvania in November 1887, but her hull was subcontracted to the Delaware River Iron Shipbuilding & Engine Works which laid down her keel in June 1888. Bennington was launched in June 1890. After her June 1891 commissioning at New York, Bennington joined the Squadron of Evolution for its cruise to South America. The gunboat made two Mediterranean tours between 1892 and 1894, after which she was assigned to duties in the Pacific. She sailed the Pacific coasts of North and Central America and spent time in the Hawaiian Islands protecting American interests there. On her way to support U.S. Army operations of the Philippine–American War, Bennington claimed Wake Island for the United States. After two years in the Philippines, she returned to the United States and was taken out of commission for 18 months for repairs and refitting. After her March 1903 re-commissioning, most of the next two years were spent patrolling the Pacific coasts of North and South America.[10]

On 21 July 1905 at San Diego, California, Bennington suffered a boiler explosion that killed 66 men and injured nearly everyone else on board. Shortly after the explosion, a tug beached the ship to prevent her from sinking. Eleven men were awarded the Medal of Honor for "extraordinary heroism" in the aftermath of the explosion. After Bennington was refloated, the damage was deemed too extensive to repair and the ship was decommissioned in September.[10] The ship was sold for scrapping in 1910, but instead served as a water barge for the Matson Line at Honolulu from 1912. The former Bennington was scuttled off the coast of Oahu in 1924.[3][11]