The first decade of his endeavor brought little result, for the Sahara shore was forbidding and the sailors timid.
Then in 1434 Gil Eannes doubled Cape Bojador and found its dangers imaginary.

Subsequent voyages added to the extent of coast skirted until the desert began to give place to inhabited country.

The Prince was now eager for captives to be taken who might inform him of the country, and in 1441 Antam Gonsalvez brought several Moors from the southern edge of the desert, who, while useful as informants, advanced a new theme of interest by offering to ransom themselves by delivering on the coast a larger number of non-Mohammedan negroes, whom the Moors held as slaves.

Partly for the sake of profit, though the chronicler says more largely to increase the number of souls to be saved, this exchange was effected in the following year in the case of two of the Moors, while a third took his liberty without delivering his ransom.

After the arrival in Portugal of these exchanged negroes, ten in number, and several more small parcels of captives, a company organized at Lagos under the direction of Prince Henry sent forth a fleet of six caravels in 1444 which promptly returned with 225 captives, the disposal of whom has been recounted at the beginning of this chapter.
[Footnote 8: The chief source for the early Portuguese voyages is Azurara's _Chronicle of the Discovery and Conquest of Guinea_, already cited.] In the next year the Lagos Company sent a great expedition of twenty-six vessels which discovered the Senegal River and brought back many natives taken in raids thereabout; and by 1448 nearly a thousand captives had been carried to Portugal.