Argentine Army

 The Argentine Army (Ejército Argentino, EA) is the land armed force branch of the Armed Forces of the Argentine Republic and the senior military service of the country which was offically founded on May 29, 1810.

Argentine Army in Southern Victory
When the Great War began in 1914, Argentina was a member of the Entente. This made them the target of both the Chilean and Paraguayan armies and they invaided the country in 1916. Unfortunately, this invasion was defeated by the Argentine Army, and resulted in the the US Navy sending a sizeable force south to help their allies.

After the Great War, the Argentine Army continued to have clashes along it's border, and even accepted Confederate mercenaries into their ranks, commanding barrels.