The answer to this question is to be found in the Frisian version of the story. Alexander had bought the ships on the Indus, or had had them built by the descendants of the Frisians who settled there--the Geertmen--and had taken into his service sailors from among them, and at the head of them was Friso. Alexander having accomplished his voyage and the transport of his troops, had no further use for the ships in the Persian Gulf, but wished to employ them in the Mediterranean. He had taken that idea into his head, and it must be carried into effect. He wished to do what no one had done before him. For this purpose Nearchus was to sail up the Red Sea, and on his arrival at Suez was to find 200 elephants, 1000 camels, workmen and materials, timber and ropes, &c., in order to haul the ships by land over the isthmus. This work was carried on and accomplished with so much zeal and energy that after three months' labour the fleet was launched in the Mediterranean. That the fleet really came to the Mediterranean appears in Plutarch's "Life of Alexander;" but he makes Nearchus bring the fleet round Africa, and sail through the Pillars of Hercules. After the defeat at Actium, Cleopatra, in imitation of this example, tried to take her fleet over the isthmus in order to escape to India, but was prevented by the inhabitants of Arabia Petræa, who burnt her ships. (See Plutarch's "Life of Antony.") When Alexander shortly afterwards died, Friso remained in the service of Antigonus and Demetrius, until, having been grievously insulted by the latter, he resolved to seek out with his sailors their fatherland, Friesland. To India he could not, indeed, return. Thus these accounts chime in with and clear up each other, and in that way afford a mutual confirmation of the events. Such simple narratives and surprising results led me to conclude that we had to do here with more than mere Saga and Legends. Since the last twenty years attention has been directed to the remains of the dwellings on piles, first observed in the Swiss lakes, and afterwards in other parts of Europe. (See Dr E. Rückert, "Die Pfahlbauten;" Würzburg, 1869. Dr T. C. Winkler, in the "Volksalmanak," t. N. v. A. 1867.) When they were found, endeavours were made to discover, by the existing fragments of arms, tools, and household articles, by whom and when these dwellings had been inhabited. There are no accounts of them in historical writers, beyond what Herodotus writes in book v. chapter 16, of the "Paeonen." The only trace that has been found is in one of the panels of Trajan's Pillar, in which the destruction of a pile village in Dacia is represented.