The Battle of Mendaza was an early battle of the First Carlist War, occurring on December 12, 1834, at Mendaza, Navarre. 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.