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,
Bernardo de Brito Bernardo de Brito Friar Bernardo de Brito (20 August 1569 – 27 February 1617) was a Portuguese monk and historian. He is perhaps best known for having authored the first two volumes of "Monarchia Lusytana", his "magnum opus". Friar Bernardo de Brito was born Baltasar de Brito e Andrade, in the fortified village of Almeida in 1569. His father, Pedro Cardoso de Andrade, was a distinguished army captain who fought in Italy and Flanders who was killed in action during the Siege of Antwerp; his mother was Maria de Brito e Andrade, the sister of Rui de Andrade Freire, "alcaide"