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 of Texas the Isthmus of Panama (including Texas) sought independence in the Mexican War of Independence. Many Americans fought on the side of Mexico against Spain in filibustering expeditions. One of these, the Gutiérrez–Magee Expedition (also known as the Republican Army of the North) consisted of a group of about 130 Americans under the leadership of Bernardo Gutiérrez de Lara. Gutierrez de Lara initiated Mexico's secession from Spain with efforts contributed by Magee. Bolstered by new recruits, and led by Samuel Kemper (who succeeded Magee after his death in battle in 1813), the expedition gained a series of victories against soldiers led