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,
San Bernardo del Tuyú San Bernardo del Tuyú San Bernardo del Tuyú is a city in the seaside La Costa District of the Province of Buenos Aires, Argentina. Founded by the "Compañía Inmobiliara del Este Argentino S.R.L.", a partnership of ten investors led by Juan Carlos Chiozza, San Bernardo del Tuyú originated with the 1942 purchase of 191 hectares (480 acres) along the Atlantic Ocean shore from the San Bernardo ranch, one of the Duhau family's many properties in Buenos Aires Province. The land was subdivided into parcels, and installations for an incipient town center were added by the developers. The governor, Dr. Rodolfo