Synopsis by Mark Deming
Two bands of rival soldiers discover they have more in common than they imagined in this dark comedy. Rodrigo Rojas (Nicolas Saavedra) is a private in the Chilean Army whose outfit is called into action when a border dispute flares up with Argentina. Rojas and his fellow soldiers -- including level-headed sergeant Ferrer (Erto Pantoja), hot-tempered Orozco (Victor Montero), and luckless Almonacid (Andreas Olea) -- are marching to the front when their compass proves faulty, and the men end up in Patagonia without any idea if they're on Chilean or Argentinean soil. As the Chileans set up base, they discover a small company of Argentinean soldiers are waiting in a trench less than a football field away, but suddenly neither side is sure just what to do, especially when they realize their uniforms are all but impossible to tell apart from a distance. A stray dog appears that passes notes between the two camps, and before long a wary conviviality grows between them, though they're still not certain if they should regard one another as friends or enemies. Directed by Alex Bowen, Mi Mejor Enemigo (aka My Best Enemy) was inspired by an actual border skirmish between Chile and Argentina in 1978.