The action of Juncalito was a military engagement of the Argentine War of Independence, previous to the Crossing of the Andes campaign. On March 10, 1816, nine months before the crossing of the Andes, José Félix Aldao led a group of Mounted Grenadiers to the Uspallata Pass. They had to find out whenever the pass was secure or the Spanish Royalists had fortified it. They found a scout Royalist group, and managed to capture them without firing a single shot. They captured a sergeant, a corporal and 15 soldiers.