was the second vessel in the two-ship of armoured cruisers in the Imperial Japanese Navy. She was named after Mount Ikoma located on the border of Osaka and Nara prefecture. On 28 August 1912, Ikoma was re-classified as a battlecruiser. Background Construction of the Tsukuba-class cruisers was ordered under the June 1904 Emergency Fleet Replenishment Budget of the Russo-Japanese War, spurred on by the unexpected loss of the battleships and to naval mines in the early stages of the war. These were the first major capital ships to be designed and constructed entirely by Japan in a Japanese shipyard, albeit with imported weaponry and numerous components. However, Tsukuba and Ikoma were designed and completed in a very short time, and suffered from numerous technical and design problems, including strength of its hull, stability and mechanical failures. The ship was reclassified as a battlecruiser in 1912. Design The Tsukuba-class design had a conventional armored cruiser hull design, powered by two vertical triple-expansion steam engines, with twenty Miyabara boilers, yielding design speed of and a range of at . During speed trials in Hiroshima Bay prior to commissioning, Tsukuba attained a top speed of . Ikoma was one of the first ships in the Japanese navy with boilers capable of burning either coal or heavy fuel oil. In terms of armament, the Tsukuba class was one of the most heavily armed cruisers of its time, with four 12-inch 41st Year Type guns as the main battery, mounted in twin gun turrets to the fore and aft, along the centerline of the vessel. Secondary armament consisted of twelve guns and twelve 4.7-inch 41st Year Type guns, and four QF 3-pounder Hotchkiss guns. Service record Ikoma was laid down on 15 March 1905, launched 9 April 1906 and commissioned on 24 March 1908 at Kure Naval Arsenal, with Captain Egarashi Yasutaro as her chief equipping officer and first captain. Shortly after commissioning at the Kure Naval Arsenal, Ikoma escorted the United States Navy’s Great White Fleet through Japanese waters on its around-the-world voyage in October 1908. In 1910, Ikoma was sent on a voyage to Argentina to attend that nation’s independence centennial celebrations. From Buenos Aires, she continued on across the Atlantic Ocean to London, England and to other ports in Europe and returned to Japan via the Indian Ocean, thus circumnavigating the globe. Ikoma served in World War I, initially during the blockade