Battle of Uhud in order to build up strength for another advance on Medina. The success of the Meccans' rousing of tribes against Muhammad reaped disastrous consequences for him and the Muslims with two main losses: one was where a Muslim party had been invited by a chieftain of the Ma'unah tribe, who were then killed as they approached by the tribe of Sulaym; while the other was when the Muslims had sent out instructors to a tribe which stated it wanted to convert to Islam — the instructors had been led into an ambush by the guides of the would-be Muslim tribe,
Army of the North victory. The battle was favorable to Balcarce even though he again had numerical inferiority (800 royalist against 600 rebels, and in Cotagaita 2,000 royalists against 1,100 rebels). Balcarce earned the rank of brigadier, and the confidence to advance towards the Desaguadero River, border of the viceroyalty in colonial times. Due to internal disagreements Castelli had to dismiss Güemes and his gaucho soldiers. The royalist defenses were left in charge of general José Manuel de Goyeneche, who met with Castelli and signed an armistice to last for forty days from 16 May. The army moved from the encampment at La Laja,