Tampico Affair

The Tampico Affair began as a minor incident involving U.S. sailors and Mexican land forces loyal to General Victoriano Huerta during the guerra de las facciones phase of the Mexican Revolution. The misunderstanding occurred on April 9, 1914, but then developed into a breakdown of diplomatic relations between the two countries, and the occupation of the port city of Veracruz for over six months.

• http://en.wikipedia.org/wiki/Tampico Affair