Cabrera enjoyed relatively good relations with the area's native inhabitants, the Comechingones, and proved an able administrator of the new settlement, which within a year counted with the basic legal and administrative institutions of a stable village. He departed towards the east on his own initiative in 1574 and quickly reached the shores of the Paraná River, over 200 mi (320 km) away, establishing the Fort of San Luis (near what today is Santa Fe, Argentina). Founding the Viceroyalty of Perú's first viable beach-head towards the Atlantic Ocean (via the highly-navigable Paraná), the feat met with the rivalry of Captain Juan de Garay, who had been sent down the river from Asunción with orders from the Viceroy to do the same.Levene, Ricardo. A History of Argentina. University of North Carolina Press, 1937.
