Also in early January of the same year, Blas Antonio Sáenz and José León Sandoval formed a counter-government against Silvestre Selva Sacasa in Masaya, who was appointed by Malespín to serve as provisional Supreme Director during the War.

After Malespín was overthrown by his Vice President in El Salvador, he signed a peace treaty in León with Sandoval, and Muñoz was resigned to the leadership of that city.

[3] In October 1854, Francisco Castellón entered into a contract with US military contractor Byron Cole to supply 200 men led by William Walker in June 1855.

Muñoz became commander-in-chief of the troops of the Democratic Party, which had power in León under Castellón against the presidency of Ponciano Corral and José María Estrada.

The first rush overran the Conservatives' trenches and destroyed a cannon, but Muñoz received a fatal shot in the ribs, and relinquished his command to Colonel José María Sarria.