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 Izaguirre de los Reyes him as Archbishop of La Plata o Charcas. He served as Archbishop of La Plata o Charcas until his death on November 16, 1668. While bishop, he was the principal consecrator of Gabriel de Guilléstegui, Bishop of Paraguay. Bernardo de Izaguirre de los Reyes Bernardo de Izaguirre de los Reyes (died November 16, 1668) was a Roman Catholic prelate who served as Archbishop of La Plata o Charcas (1669–1670), Bishop of Cuzco (1662–1669), and Bishop of Panamá (1654–1659). Bernardo de Izaguirre de los Reyes was selected on July 28, 1654 and confirmed on April 21, 1655 by Pope Alexander VII