Paraguayan War
Fall of Asunción

En route to Asunción, the Allied army went 200 kilometres (120 mi) north to Palmas, stopping at the Piquissiri River. There Solano López had concentrated 12,000 Paraguayans in a fortified line that exploited the terrain and supported the forts of Angostura and Itá-Ibaté.

Resigned to frontal combat, Caxias ordered the so-called Piquissiri maneuver. While a squadron attacked Angostura, Caxias made the army cross to the west side of the river. He ordered the construction of a road in the swamps of the Gran Chaco along which the troops advanced to the northeast. At Villeta the army crossed the river again, between Asunción and Piquissiri, behind the fortified Paraguayan line.

Instead of advancing to the capital, already evacuated and bombarded, Caxias went south and attacked the Paraguayans from the rear in December 1868, in an offensive which became known as "Dezembrada". Caxias' troops were ambushed while crossing the Itororó during an initial advance, during which the Paraguayans inflicted severe damage on the Brazilian armies. Days later, however, the Allies destroyed a whole Paraguayan division at the Battle of Avay. Weeks later, Caxias won another decisive victory at the Battle of Lomas Valentinas and captured the last stronghold of the Paraguayan Army in Angostura. On 24 December, Caxias sent a note to Solano López asking for surrender, but Solano López refused and fled to Cerro León. Alongside the Paraguayan president was the American Minister-Ambassador, Martin T. McMahon, who after the war became a fierce defender of López's cause.

Asunción was occupied on 1 January 1869, by Brazilian general João de Souza da Fonseca Costa, father of the future marshal Hermes da Fonseca. On 5 January, Caxias entered the city with the rest of the army. Most of Caxias army settled in Asunción, where also 4,000 Argentine and 200 Uruguayan troops soon arrived together with about 800 soldiers and officers of the Paraguayan Legion. By this time, Caxias was ill and tired. On 17 January, he fainted during a mass; he relinquished his command the next day, and the day after that left for Montevideo.

Very soon the city hosted about 30,000 Allied soldiers; for the next few months these looted almost every building, including diplomatic missions of European nations.
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