 This letter mentioned a royalist army led by Goyeneche marching to Jujuy.Balcarce, who had advanced to Potosi, was defeated by Nieto in the Battle of Cotagaita, so Castelli sent two hundred men and two cannon to strengthen his forces.With these reinforcements, Balcarce achieved victory at the Battle of Suipacha, which allowed patriots to control all of Upper Peru unopposed.