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,
Republic Day (Armenia) Declared its sovereignty on 28 May 1918. Armenia was proclaimed an independent republic on May 28, 1918. The republic immediately experienced massive hunger, and a massive influx of refugees. The republic was short lived, and as of December 2, 1920, the Red Army entered Armenia and it was proclaimed it a Soviet Republic. Armenia regained its independence as the current Republic of Armenia in 1991. The Republic of Armenia celebrated its first Republic Day with a parade on Republic Square, led by Lieutenant General Norat Ter-Grigoryants. The Republic Day celebrations conicide with the anniversary of the Battle of Sardarabad, which