Things really begin to go down the tubes between Gen. Huerta's Mexico and the United States when Federal authorities arrested 8 U.S. sailors from the USS Dolphin, assuming for some reason that they were Constitutionalist.
The sailors were released, but U.S. Rear Admiral Henry T. Mayo demanded a 21-gun salute and formal apology from the Mexican government. Huerta gave a written apology instead but refused to have his forces raise the U.S. flag on Mexican soil to provide a 21-gun salute, for which he really can't be blamed.
US cries for intervention in Mexico, immediately followed.
On the same day, Captain Gustavo Salinas Camiña, flying for the Constitutionalists, piloted a Glenn L. Martin biplane loaded with explosives in an attack on Mexican Federal gunboats Guerrero and Morelos, which were blocking Tampico's harbor. Neither plane nor ships were hit. It was the first aerial attack on ships.
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