| Operation Primicia | |||||
|---|---|---|---|---|---|
| Part of the Dirty War | |||||
 Entrance to the barracks (1975) | |||||
| |||||
| Belligerents | |||||
 Montoneros |
 Argentine Army | ||||
| Casualties and losses | |||||
| 15 killed | 12 killed | ||||
| 3 civilians killed | |||||
Operation Primicia ("Scoop") was a large guerrilla assault that took place on 5 October 1975, in Formosa, Argentina. It was the largest attack ever launched by the paramilitary group Montoneros, which attempted to seize the barracks of the 29th Forest Infantry Regiment. The incident escalated the Dirty War, which led to the 1976 Argentine coup d'état the following year.[1]