On 9 January 1817, 10 days after Bolívar's and Arismendi's arrival in mainland Venezuela, the force, which had been bolstered with 900 more soldiers, was on the way to Puerto Píritu.[2] It was there that they were attacked by a Royalist force from an entrenched position near the Unare River. The group had around 890 soldiers, including 330 native archers and 10 horsemen.
During the course of battle, a native force led by José María Charuán, Chief of Clarines tribe,[3] marched through the forest to attack the Patriots from the rear. This outflanking maneuver caused the Patriot forces to panic, scatter and be massacred.[4] Many survivors were driven into the forest, where they drowned or were later captured and executed.[5] In all, around 900 Patriot forces were killed.[4][2][6]
The battle was a major loss for the Patriot forces. Few survived the battle, including Bolívar, Arismendi, and five more officers.[2]
^Restrepo, José Manuel (1858). Historia de la revolución de la República de Colombia en la América Meridional. Tomo II. Bogotá: Imprenta de José Jacquin. p.374