The fourth USS St. Louis, Cruiser No. 20 (C-20), was the lead ship

Lead ship

The lead ship or class leader is the first of a series or class of ships all constructed according to the same general design. The term is applicable military ships and larger civilian craft.-Overview:...

 of her class

St. Louis class cruiser (1905)

The St. Louis class cruiser were a group of three protected cruisers used by the United States Navy at the beginning of the 20th century.-Class history:...

 of protected cruiser

Protected cruiser

The protected cruiser is a type of naval cruiser of the late 19th century, so known because its armoured deck offered protection for vital machine spaces from shrapnel caused by exploding shells above...

s in the United States Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

. St. Louis was launched on 6 May 1905 by Neafie & Levy Company, Philadelphia, Pennsylvania

Philadelphia, Pennsylvania

Philadelphia is the largest city in the Commonwealth of Pennsylvania and the county seat of Philadelphia County, with which it is coterminous. The city is located in the Northeastern United States along the Delaware and Schuylkill rivers. It is the fifth-most-populous city in the United States,...

; sponsored by Miss Gladys Bryant Smith; and commissioned on 18 August 1906, Captain Nathaniel R. Usher in command.

Pre-war

Assigned to the Pacific Fleet

United States Pacific Fleet

The United States Pacific Fleet is a Pacific Ocean theater-level component command of the United States Navy that provides naval resources under the operational control of the United States Pacific Command. Its home port is at Pearl Harbor Naval Base, Hawaii. It is commanded by Admiral Patrick M...

, St. Louis departed Tompkinsville, New York, on 15 May 1907 following completion of her trials along the Virginia

Virginia

The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...

 coast. St. Louis called at Port Castries

Castries

Castries , population 10,634, aggl. 37,963 , is the capital city of Saint Lucia, a country in the Caribbean. The district with the same name had a population of 61,341 in 2001-05-22, and stretches over an area of ....

, Bahia

Salvador, Bahia

Salvador is the largest city on the northeast coast of Brazil and the capital of the Northeastern Brazilian state of Bahia. Salvador is also known as Brazil's capital of happiness due to its easygoing population and countless popular outdoor parties, including its street carnival. The first...

, Rio de Janeiro

Rio de Janeiro

Rio de Janeiro , commonly referred to simply as Rio, is the capital city of the State of Rio de Janeiro, the second largest city of Brazil, and the third largest metropolitan area and agglomeration in South America, boasting approximately 6.3 million people within the city proper, making it the 6th...

, Montevideo

Montevideo

Montevideo is the largest city, the capital, and the chief port of Uruguay. The settlement was established in 1726 by Bruno Mauricio de Zabala, as a strategic move amidst a Spanish-Portuguese dispute over the platine region, and as a counter to the Portuguese colony at Colonia del Sacramento...

, Punta Arenas, Valparaíso

Valparaíso

Valparaíso is a city and commune of Chile, center of its third largest conurbation and one of the country's most important seaports and an increasing cultural center in the Southwest Pacific hemisphere. The city is the capital of the Valparaíso Province and the Valparaíso Region...

, Callao

Callao

Callao is the largest and most important port in Peru. The city is coterminous with the Constitutional Province of Callao, the only province of the Callao Region. Callao is located west of Lima, the country's capital, and is part of the Lima Metropolitan Area, a large metropolis that holds almost...

, and Acapulco

Acapulco

Acapulco is a city, municipality and major sea port in the state of Guerrero on the Pacific coast of Mexico, southwest from Mexico City. Acapulco is located on a deep, semi-circular bay and has been a port since the early colonial period of Mexico’s history...

 before arriving at San Diego on 31 August 1907. Operating off the west coast into the spring of 1908, she steamed from Puget Sound

Puget Sound

Puget Sound is a sound in the U.S. state of Washington. It is a complex estuarine system of interconnected marine waterways and basins, with one major and one minor connection to the Strait of Juan de Fuca and the Pacific Ocean — Admiralty Inlet being the major connection and...

 to Honolulu in June, then cruised in Central America

Central America

Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...

n waters from July to October. On 5 November 1909, St. Louis returned to Puget Sound and was placed in reserve on 14 November.

Decommissioned on 3 May 1910, St. Louis was recommissioned, in reserve, on 7 October 1911 at the Puget Sound Navy Yard. She departed Puget Sound on 13 July 1911 for San Francisco and brief service as receiving ship there. After undergoing repairs, 22 July 1911 to 28 February 1912, she joined the Pacific Reserve Fleet  again on 12 March. From 14 July 1912 until 26 April 1913, she operated in support of the Oregon Naval Militia, then returned to the Puget Sound Navy Yard to be placed in the Pacific Reserve Fleet for a year. She departed Puget Sound on 24 April 1914 and commenced her next assignment as receiving ship at San Francisco on the 27th. Returning north to Bremerton, St. Louis was again placed in the Pacific Reserve Fleet on 17 February 1916.

Detached from the Reserve Fleet on 10 July 1916, St. Louis departed Puget Sound on 21 July for Honolulu. Arriving at Pearl Harbor

Pearl Harbor

Pearl Harbor, known to Hawaiians as Puuloa, is a lagoon harbor on the island of Oahu, Hawaii, west of Honolulu. Much of the harbor and surrounding lands is a United States Navy deep-water naval base. It is also the headquarters of the U.S. Pacific Fleet...

 on 29 July, she commenced her next duty assignment as tender, Submarine Division Three, Pacific Fleet, with additional duty as station ship, Pearl Harbor. When it became evident that the crew of the interned German

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 sloop

Sloop

A sloop is a sail boat with a fore-and-aft rig and a single mast farther forward than the mast of a cutter....

 Geier intended to scuttle their ship, an armed party from St. Louis boarded the ship on 4 February 1917 and seized her. Geier subsequently served the United States as .

World War I

Placed in reduced commission on 6 April 1917, as the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 entered World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

, St. Louis departed Honolulu on 9 April to join the cruiser force engaged in escorting convoys bound for Europe. Calling first at San Diego, she took on board 517 National Naval Volunteers and apprentice seamen to bring her war complement to 823 officers and men; and, on 20 April, she was placed in full commission. A month later, she arrived in the Panama Canal Zone

Panama Canal Zone

The Panama Canal Zone was a unorganized U.S. territory located within the Republic of Panama, consisting of the Panama Canal and an area generally extending 5 miles on each side of the centerline, but excluding Panama City and Colón, which otherwise would have been partly within the limits of...

; embarked the 7th, 17th, 20th, 43d, 51st, and 55th companies of Marines; transported them to Santiago de Cuba

Santiago de Cuba

Santiago de Cuba is the second largest city of Cuba and capital city of Santiago de Cuba Province in the south-eastern area of the island, some south-east of the Cuban capital of Havana....

; then sailed for Philadelphia, arriving on 29 May 1917.

St. Louiss' first convoy duty began on 17 June 1917 when she departed New York

New York

New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...

 in escort of Group 4, American Expeditionary Force

American Expeditionary Force

The American Expeditionary Forces or AEF were the United States Armed Forces sent to Europe in World War I. During the United States campaigns in World War I the AEF fought in France alongside British and French allied forces in the last year of the war, against Imperial German forces...

. Returning to Boston

Boston

Boston is the capital of and largest city in Massachusetts, and is one of the oldest cities in the United States. The largest city in New England, Boston is regarded as the unofficial "Capital of New England" for its economic and cultural impact on the entire New England region. The city proper had...

 for repairs on 19 July 1917, she had completed six additional voyages, escorting convoys bound from New York for ports in Britain

United Kingdom of Great Britain and Ireland

The United Kingdom of Great Britain and Ireland was the formal name of the United Kingdom during the period when what is now the Republic of Ireland formed a part of it....

 and France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 by the end of the war.

Post-war

After the Armistice

Armistice

An armistice is a situation in a war where the warring parties agree to stop fighting. It is not necessarily the end of a war, but may be just a cessation of hostilities while an attempt is made to negotiate a lasting peace...

, St. Louis was immediately pressed into service returning troops to the United States. She returned 8,437 troops to Hoboken, New Jersey

Hoboken, New Jersey

Hoboken is a city in Hudson County, New Jersey, United States. As of the 2010 United States Census, the city's population was 50,005. The city is part of the New York metropolitan area and contains Hoboken Terminal, a major transportation hub for the region...

, from Brest, France

Brest, France

Brest is a city in the Finistère department in Brittany in northwestern France. Located in a sheltered position not far from the western tip of the Breton peninsula, and the western extremity of metropolitan France, Brest is an important harbour and the second French military port after Toulon...

, in seven round-trip crossings between 17 December 1918 and 17 July 1919 when she arrived at the Philadelphia Navy Yard for repairs.

Designated CA-18 on 17 July 1920 and assigned to postwar duty with the European Squadron

European Squadron

The European Squadron, also known as the European Station, was a part of the United States Navy in the late 19th century and the early 1900s. The squadron was originally named the Mediterranean Squadron and renamed following the American Civil War...

, St. Louis departed Philadelphia on 10 September 1920 for Sheerness

Sheerness

Sheerness is a town located beside the mouth of the River Medway on the northwest corner of the Isle of Sheppey in north Kent, England. With a population of 12,000 it is the largest town on the island....

, Cherbourg, and Constantinople

Constantinople

Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

. She disembarked military passengers at Sheerness on 26 September, then continued on to the Mediterranean and reported to the Commander, United States Naval Forces in Turkish

Turkey

Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...

 Waters at Constantinople on 19 October. Standing up the Bosphorus from Constantinople on 13 November, St. Louis embarked refugees at Sevastopol

Sevastopol

Sevastopol is a city on rights of administrative division of Ukraine, located on the Black Sea coast of the Crimea peninsula. It has a population of 342,451 . Sevastopol is the second largest port in Ukraine, after the Port of Odessa....

 and Yalta

Yalta

Yalta is a city in Crimea, southern Ukraine, on the north coast of the Black Sea.The city is located on the site of an ancient Greek colony, said to have been founded by Greek sailors who were looking for a safe shore on which to land. It is situated on a deep bay facing south towards the Black...

, returning them to Constantinople on 16 November. The following day, her crew formed boat landing parties to distribute food among refugees quartered aboard naval transports anchored in the Bosphorus. St. Louis continued her humanitarian duties at Constantinople and at Anatolia

Anatolia

Anatolia is a geographic and historical term denoting the westernmost protrusion of Asia, comprising the majority of the Republic of Turkey...

n ports during the time of unrest caused by the Russian Civil War

Russian Civil War

The Russian Civil War was a multi-party war that occurred within the former Russian Empire after the Russian provisional government collapsed to the Soviets, under the domination of the Bolshevik party. Soviet forces first assumed power in Petrograd The Russian Civil War (1917–1923) was a...

 and the Turkish revolution.

She departed Asia Minor

Asia Minor

Asia Minor is a geographical location at the westernmost protrusion of Asia, also called Anatolia, and corresponds to the western two thirds of the Asian part of Turkey...

 for Naples

Naples

Naples is a city in Southern Italy, situated on the country's west coast by the Gulf of Naples. Lying between two notable volcanic regions, Mount Vesuvius and the Phlegraean Fields, it is the capital of the region of Campania and of the province of Naples...

 on 19 September 1921 and called at Gibraltar

Gibraltar

Gibraltar is a British overseas territory located on the southern end of the Iberian Peninsula at the entrance of the Mediterranean. A peninsula with an area of , it has a northern border with Andalusia, Spain. The Rock of Gibraltar is the major landmark of the region...

.

Decommissioning and fate

On 11 November St. Louis arrived at Philadelphia where, on completion of pre-inactivation overhaul, she was decommissioned on 3 March 1922. In reserve until struck from the Navy List

Naval Vessel Register

The Naval Vessel Register is the official inventory of ships and service craft in custody of or titled by the United States Navy. It contains information on ships and service craft that make up the official inventory of the Navy from the time a vessel is authorized through its life cycle and...

 on 20 March 1930, St. Louis hulk was sold for scrapping on 13 August in accordance with the provisions of the London Naval Treaty

London Naval Treaty

The London Naval Treaty was an agreement between the United Kingdom, the Empire of Japan, France, Italy and the United States, signed on April 22, 1930, which regulated submarine warfare and limited naval shipbuilding. Ratifications were exchanged in London on October 27, 1930, and the treaty went...

 and Second London Naval Treaty

Second London Naval Treaty

The Second London Naval Disarmament Conference opened in London, the United Kingdom, on 9 December 1935. It resulted in the Second London Naval Treaty which was signed on 25 March 1936.- Description :...

for the limitation and reduction of naval armament.