Argentine War of Independence Chile, allied with the Mapuches. On April 4, Argentine Colonel Juan Gregorio de Las Heras had occupied Concepción, but the Royalists retreated to Talcahuano. In early 1818, Royalist reinforcements from the Viceroyalty of Peru arrived, commanded by general Mariano Osorio, and advanced towards the capital. San Martín then turned to scorched earth tactics and ordered the evacuation of Concepción, which he thought was impossible to defend. On 18 February 1818, the first anniversary of the battle of Chacabuco, Chile declared its independence from the Spanish Crown. On March 18, 1818, Osorio led a surprise attack on the joint Argentine-Chilean army,
Battle of Quechereguas Battle of Quechereguas The battle of Quechereguas occurred on 8 April 1814, during the War of Chilean Independence. The Royalists had taken the key Patriot town of Talca in March, 1814, and an army, under the command of Gabino Gaínza, now threatened to advance on the Patriot capital of Santiago itself. Bernardo O' Higgins, the famous Patriot leader, attempted to intervene to prevent this. Gabino Gaínza had crossed over the Maule river with his forces, advancing northwards. O' Higgins was unable to pursue him during the day, because of the size of the Royalist force. During the night, however, O'