Historian Rufino Blanco Fombona says that "By 1824 Bernardino Rivadavia had made a pact with Spanish, obstructing the Ayacucho Campaign": on 4 July 1823 Buenos Aires made a truce with Spanish commissionaires (Preliminary Peace Convention (1823)) that forced it to send negotiators to other South American governments so that it could take effect. It was stipulated that hostilities would cease 60 days after its ratification and would subsist over a year and half; meanwhile, a definitive peace and friendship would be negotiated. This was the reason for which they had a meeting in Salta Juan Gregorio de Las Heras city with brigadier Baldomero Espartero, obtaining no agreement. Among other measures taken by the viceroy for containing the imminent rebellion, on 10 January 1824 Casimiro Olañeta was ordered: