On the 5th day of September, Drake left his brother with the ship at Darien, and set out with two pinnaces towards the Rio Grande, which they reached in three days, and, on the 9th, were discovered by a Spaniard from the bank, who believing them to be his countrymen, made a signal to them to come on shore, with which they very readily complied; but he, soon finding his mistake, abandoned his plantation, where they found great plenty of provisions, with which, having laden their vessels, they departed. So great was the quantity of provisions which they amassed here and in other places, that in different parts of the coast they built four magazines or storehouses, which they filled with necessaries for the prosecution of their voyage. These they placed at such a distance from each other, that the enemy, if he should surprise one, might yet not discover the rest. In the mean time, his brother, captain John Drake, went, according to the instructions that had been left him, in search of the Symerons, or fugitive negroes, from whose assistance alone they had now any prospect of a successful voyage; and touching upon the mainland, by means of the negro whom they had taken from Nombre de Dios, engaged two of them to come on board his pinnace, leaving two of their own men as hostages for their returning. These men, having assured Drake of the affection of their nation, appointed an interview between him and their leaders. So leaving port Plenty, in the isle of Pines, so named by the English from the great stores of provisions which they had amassed at that place, they came, by the direction of the Symerons, into a secret bay, among beautiful islands covered with trees, which concealed their ship from observation, and where the channel was so narrow and rocky, that it was impossible to enter it by night, so that there was no danger of a sudden attack. Here they met, and entered into engagements, which common enemies and common dangers preserved from violation. But the first conversation informed the English, that their expectations were not immediately to be gratified; for, upon their inquiries after the most probable means of gaining gold and silver, the Symerons told them, that had they known sooner the chief end of their expedition, they could easily have gratified them; but that during the rainy season, which was now begun, and which continues six months, they could not recover the treasure, which they had taken from the Spaniards, out of the rivers in which they had concealed it. Drake, therefore, proposing to wait in this place, till the rains were past, built, with the assistance of the Symerons, a fort of earth and timber, and leaving part of his company with the Symerons, set out with three pinnaces towards Carthagena, being of a spirit too active to lie still patiently, even in a state of plenty and security, and with the most probable expectations of immense riches.