Enjoying a brief period of peace, the United States is caught by surprise when a government overthrow in Mexico suddenly destabilizes the two countries almost 2000 mile long undefended border. Diplomatic negotiations begin, but a series of savage cross-border attacks on civilians compels the U.S. to mobilize its armed forces, invade Mexico and establish a security zone. While politicians and the people debate the controversial invasion, the United States Army must win quickly what could deteriorate into a long, bloody war.

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