In the midst of the Mexican Revolution, General Victoriano Huerta became President of Mexico following a coup to oust the democratically-elected president,
Francisco I. Madero. Opposition to Huerta grew from the forces of peasant leader
Emiliano Zapata in the state of Morelos and the rapid advance of the Northern opposition
Constitutionalists under the leadership of
Governor of Coahuila Venustiano Carranza. By March 26, 1914, Carranza's forces were from the prosperous coastal oil town of
Tampico, Tamaulipas. There was a large settlement of US citizens there due to the immense investment by US firms in the local oil industry. Several US Navy warships commanded by
Rear Admiral Henry T. Mayo were deployed off the coast for the stated purpose of protecting US citizens and property. By the spring of 1914, relations between the US and Mexico were strained.
US President Woodrow Wilson refused to recognize the presidency of Mexican General
Victoriano Huerta, who came to power by a coup d'état, with rebel
General Félix Díaz, a nephew of ex-President
Porfirio Díaz, had signed the Embassy Pact with the approval of US Ambassador
Henry Lane Wilson, who had since been removed by the president. Mayo's
Fifth Division of the Atlantic Fleet was in
Tampico to protect American lives and interest. Ships at his disposal included the battleships and and cruisers and . US interests included the
Standard Oil refinery at Arbol Grande, other petroleum properties at Doña Cecilia, and associated American families and homes nearby. Although Tampico was besieged by Constitutionalist forces, relations between the US forces and Huerta's federal garrison remained amicable. Mayo's
flagship, the
gunboat , honored a request of the Mexican government and fired a
21-gun salute to the Mexican flag three times on 2 April. This was in commemoration of the capture of
Puebla from the
French in 1867 by General
Porfirio Díaz. Additionally, sailors from the US gunboat and two cruisers, anchored off Tampico in the
Pánuco River, went ashore each day to play baseball. On 6 April, Constitutionalist rebel forces, under the command of Col. Emiliano J. Nafarrete, occupied La Barra, Doña Cecilia, and Arbol Grande. General Ignacio Morelos Zaragoza, Tamaulipas governor and commander of the Federal Army garrison, and nephew of the late Mexican military hero and Secretary of the Army and Navy
Ignacio Zaragoza, sent his gunboat
Veracruz to shell the rebel forces behind the oil tanks. Mayo sent a letter to both parties stating he would remain neutral, but to protect American lives and property, he would "take all necessary steps." Mayo then evacuated several Americans, but refused to land troops to protect the American-owned refinery. After additional rebel attacks on 7 and 8 April at the Iturbide Bridge, the foreign population sought refuge on the US Navy ships, the German cruiser , and British cruiser . Clarence Miller, US
consul in Tampico, sent an urgent request for help in evacuating the American population within the city. Then, on the evening of 8 April, a marine
courier for the US consulate was detained but soon released. Running short on gasoline for an auxiliary engine, ''Dolphin's'' Capt.
Ralph Earle visited the US consulate on 9 April, where he arranged a purchase from a German civilian, Max Tyron. Capt. Earle was to arrange delivery from Tyron's dock. However, the dock was located in close proximity to the Iturbide Bridge. , who commanded the landing to seize Veracruz; Vice Admiral
Charles J. Badger, Commander of US Atlantic Fleet in 1914. ==Conflict==