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,
Autonomous Republic of Crimea When the Soviet Union collapsed and Ukraine became an independent country, Crimea remained a republic within the newly independent Ukraine leading to tensions between Russia and Ukraine as the Black Sea Fleet was based on the peninsula. On 26 February 1992, the Crimean parliament renamed the ASSR the Republic of Crimea and proclaimed self-government on 5 May 1992 (which was yet to be approved by a referendum that was planned for August 1992, but postponed and never conducted) and passed the first Crimean constitution the same day. On 6 May 1992 the same parliament inserted a new sentence into this