The governor and his people, marching in this order all day, there happened, shortly after sunset, at the hour of Ave Maria, a tumult among the Indians. And a dispute arose in this wise. A spy came back from the Guaycurús, and brought back word that they were retiring for fear of the Guaranís, and that he had seen them hunting the whole day; and that their wives and children were in advance, and he believed they would settle that evening. The Guaranís had been informed, on the other hand, by some female slaves, whom they had captured a few days previously of another tribe called Merchireses, that the report current among that tribe was that the Guaycurús were engaged in war with the Guatatas, and were about to attack this tribe, and that was why they were advancing with such haste through the country.

The scouts continued to follow the enemy closely, in order to see where he would halt, and give the governor information. And he, having heard all this from the last spy, and seeing that it was a fine night, ordered the march to be continued in the same order as before, a strict watch being kept, the archers with their crossbows strung, and the arquebusiers with their arquebuses loaded and fuses lighted, as the occasion required, for although the Guaranís were marching with us and were our allies, it was prudent to observe every precaution, and place as little confidence in them as an enemy, for they are wont to be treacherous if too much trusted.