For two days they ran along the coast with a fair wind; but on the 14th a head wind and heavy sea drove them into the shelter of a deep harbour called by Columbus Puerto del Principe, which is the modern Tanamo. The number of islands off this part of the coast of Cuba confirmed Columbus in his profound geographical error; he took them to be "those innumerable islands which in the maps of the world are placed at the end of the east." He erected a great wooden cross on an eminence here, as he always did when he took possession of a new place, and made some boat excursions among the islands in the harbour. On the 17th of November two of the six youths whom he had taken on board the week before swam ashore and escaped. When he started again on his voyage he was greatly inconvenienced by the wind, which veered about between the north and south of east, and was generally a foul wind for him. There is some difference of opinion as to what point of the wind the ships of Columbus's time would sail on; but there is no doubt that they were extremely unhandy in anything approaching a head wind, and that they were practically no good at all at beating to windward. The shape of their hulls, the ungainly erections ahead and astern, and their comparatively light hold on the water, would cause them to drift to leeward faster than they could work to windward. In this head wind, therefore, Columbus found that he was making very little headway, although he stood out for long distances to the northward. On Wednesday, November 21st, occurred a most disagreeable incident, which might easily have resulted in the Admiral's never reaching Spain alive. Some time in the afternoon he noticed the Pinta standing away ahead of him in a direction which was not the course which he was steering; and he signalled her to close up with him. No answer, however, was made to his signal, which he repeated, but to which he failed to attract any response. He was standing south at the time, the wind being well in the north-east; and Martin Alonso Pinzon, whose caravel pointed into the wind much better than the unhandy Santa Maria, was standing to the east. When evening fell he was still in sight, at a distance of sixteen miles. Columbus was really concerned, and fired lombards and flew more signals of invitation; but there was no reply. In the evening he shortened sail and burned a torch all night, "because it appeared that Martin Alonso was returning to me; and the night was very clear, and there was a nice little breeze by which to come to me if he wished." But he did not wish, and he did not come.