Governor Bernardo de Velasco, who had displayed cowardice by fleeing from these battles, now plans to ask for Portuguese military protection and is ready to accept Portuguese sovereignty, which causes discontent among the victorious, Creole-led Paraguayan troops, as the Portuguese are old enemies who have annexed many Paraguayan territories.

The double victories of the Creole army over Manuel Belgrano have weakened the position of the royalists and governor Velasco and have increased the local patriotism of Creole officers, who foment a plot to overthrow Velasco.

Initially the plan calls for a military uprising to start on May 25, the one-year anniversary of the May Revolution in Buenos Aires.

The military forces, under Fulgencio Yegros, are expected to march from Itapua supported by garrisons in other towns, but the negotiations of governor Velasco with Portuguese representatives from Brazil hasten the uprising.

Yegros, born to a family of military tradition, had also pursued a military career. A grandson of governor Fulgencio Yegros y Ledesma, he had studied in Asunción and joined the Spanish colonial army.

He had first experienced combat in 1802 against the Portuguese and in 1807 when he was part of the Paraguayan forces that defended Buenos Aires during British invasions of the Río de la Plata.

Reaching the rank of captain in 1810, he had been given the governorship of Misiones; he will later establish the first military academy in independent Paraguay.

In early 1811 he had participated in the defense of Paraguay against the invaders from Buenos Aires led by Belgrano.