 From the lake, Cortés continued south along the western slopes of the Maya Mountains, a particularly arduous journey that took 12 days to cover , during which he lost more than two-thirds of his horses.When he came to a river swollen with the constant torrential rains that had been falling during the expedition, Cortés turned upstream to the Gracias a Dios rapids, which took two days to cross and cost him more horses.On 15 April 1525 the expedition arrived at the Maya village of Tenciz.