At length, they entered the Gulf of Mexico, that forbidden sea, whence by a Spanish decree, dating from the reign of Philip II., all foreigners were excluded on pain of extermination. [Footnote: _Letter of Don Luis de Onis to the Secretary of State, American State Papers_, xii. 27, 31.] Not a man on board knew the secrets of its perilous navigation. Cautiously feeling their way, they held a northerly course, till, on the twenty-eighth of December, a sailor at the mast-head of the "Aimable" saw land. La Salle and all the pilots had been led to form an exaggerated idea of the force of the easterly currents; and they therefore supposed themselves near the Bay of Appalache, when, in fact, they were much farther westward. At their right lay a low and sandy shore, washed by breakers, which made the landing dangerous. La Salle had taken the latitude of the mouth of the Mississippi, but could not determine the longitude. On the sixth of January, the "Aimable" seems to have been very near it; but his attempts to reconnoitre the shore were frustrated by the objections of the pilot of the vessel, to which, with a fatal facility, very unusual with him, he suffered himself to yield. [Footnote: Joutel, 45. He places the date on the tenth, but elsewhere corrects himself. La Salle himself says, "La hauteur nous a fait remarquer... que ce que nous avons vue, le sixieme janvier, estoit en effet la principale entree de la riviere que nous cherchions."--_Lettre de la Salle au Ministre_, 4 _Mars_, 1685.] Still convinced that the Mississippi was to the westward, he coasted the shores of Texas. As Joutel, with a boat's crew, was vainly trying to land, a party of Indians swam out through the surf, and were taken on board; but La Salle could learn nothing from them, as their language was wholly unknown to him. The coast began to trend southward. They saw that they had gone too far. Joutel again tried to land, but the surf that lashed the sand-bars deterred him. He approached as near as he dared, and, beyond the intervening breakers, saw vast plains and a dim expanse of forests; the shaggy buffalo running with their heavy gallop along the shore, and troops of deer grazing on the marshy meadows.