The Carlists had enjoyed a victory in the Battle of Venta de Echavarri in October and also the fruits of a raid on Navarre, in which Tomás de Zumalacárregui would station himself at La Berrueza with a number of supplies, clothes, money, and new troops. The morale of the Carlists was very high, and they decided to fight the Liberal troops in a formal battle (rather than with guerrilla tactics). This would happen on December 14, 1834, at the Battle of Mendaza. Tomás de Zumalacárregui concentrated his forces at the bottom of the valley of La Berrueza between Mendaza and Asarta.