 General Martín Miguel de Güemes, a rival of Rondeau, withdrew the support of his Gauchos and retired to Salta, taking with him the part of the army that was in Jujuy.After a successful battle in April at Puesto del Marquéz, near today's border between Bolivia and Argentina, Rondeau's army reached Potosí by June and Chayanta by September.In October, an attempt to overrun a small Royalist garrison at Venta y Media ended in defeat.