Lemnos or Limnos was the English-language name of Θ/Κ Λήμνος, a 13,000 ton Mississippi-class battleship originally built by the United States Navy in 1904–1908.

The ship saw limited action during World War I. Greece's pro-German monarch, Constantine I opted to remain neutral until October 1916, when pressure from the opposing Triple Entente forced him to abdicate in favor of a pro-Entente government.

The two Mississippi-class battleships were ordered under the terms of the 1903 naval appropriations, which stipulated a maximum designed displacement of 13,000 long tons (13,209 t), as recommended by senior naval officers including Admiral George Dewey and Captain Alfred Thayer Mahan, who believed a force of smaller but more numerous (pre-dreadnought) battleships would better suit the navy's needs.

[1] The displacement was limited to 3,000 long tons (3,048 t) less than the preceding Connecticut class, which necessitated significant compromises in speed, armament, and armor, making them poor designs unable to serve with the main fleet, and led to their quick disposal.

On arriving in Philadelphia, she went into drydock for maintenance that lasted from 6 July to 12 September, after which she went to Norfolk, Virginia, where her mainmast was replaced with a lattice mast.

[5] After leaving the shipyard, Idaho was assigned to the Third Squadron of the Atlantic Fleet on 17 February, in company with her sister ship Mississippi, New Hampshire, and Maine.

The four battleships met the returning Great White Fleet off Hampton Roads and was present for the naval review in the harbor there on 22 February.

Idaho then steamed south to Cuban waters for training exercises there in March and April, thereafter returning to Philadelphia on 6 May for further maintenance that concluded on 25 July.

After disembarking the men, Idaho began a series of exercises including torpedo and naval mine drills with the rest of the fleet.

In early November, the Third Squadron crossed the Atlantic to visit Europe, including stops in Gravesend, United Kingdom and Brest, France.

Her participation in these maneuvers was cut short when her starboard engine broke down, forcing her to return to Philadelphia on 17 February for repairs, which were completed in mid-August.

Target and torpedo practice followed in September, and in early October she underwent full speed and endurance tests off the coast of Maine.

By this time, conditions in Mexico had seriously deteriorated during the Mexican Revolution, so the US Navy deployed warships to protect American interests in the country.

Beginning on 30 June, the ship cruised off the coast of New England through July, followed by fleet maneuvers off Long Island in August.

[6] The Greek government bought the ships through an intermediary, the shipbuilder Fred Gauntlett, who acquired them on 8 July and handed them over to Greece.

In the meantime, Idaho and Missouri stopped in a number of ports in the region: Tangier, Morocco; Gibraltar; and Naples, Italy.

After the sale was finalized, Idaho left Missouri and steamed to Villefranche-sur-Mer, France on 17 July, where she transferred her entire crew to the battleship Maine.

[5] At the outbreak of World War I in at the end of the month, Greece's pro-German monarch, Constantine I, decided to remain neutral.

[8] Ultimately, a pro-Entente government under Prime Minister Eleftherios Venizelos replaced Constantine and declared war on the Central Powers.

[11] Operations came to a close in September 1922 when the Greek Army was forced to evacuate Smyrna by sea, along with a sizable number of civilians from Asia Minor.

[12] While en route from Smyrna to mainland Greece, Captain Dimitrios Fokas, the commander of Lemnos, formed a Revolutionary Committee with Nikolaos Plastiras and Stylianos Gonatas, two colonels who supported Venizelos, who had been ousted in 1920.

[13] In 1932, Lemnos was placed in inactive reserve; sections of her armor plate was removed to build fortifications on the island of Aegina.

[15] On 28 October 1940, Italy invaded Greece, initiating the Greco-Italian War as part of the Italian dictator Benito Mussolini's expansionist ambitions.