[Sidenote: His pretext for it.] One of the most remarkable of the enterprises which Caesar undertook during the period of these campaigns was his excursion into Great Britain. The real motive of this expedition was probably a love of romantic adventure, and a desire to secure for himself at Rome the glory of having penetrated into remote regions which Roman armies had never reached before. The pretext, however, which he made to justify his invading the territories of the Britons was, that the people of the island were accustomed to come across the Channel and aid the Gauls in their wars. [Sidenote: Caesar consults the merchants.] In forming his arrangements for going into England, the first thing was, to obtain all the information which was accessible in Gaul in respect to the country. There were, in those days, great numbers of traveling merchants, who went from one nation to another to purchase and sell, taking with them such goods as were most easy of transportation. These merchants, of course, were generally possessed of a great deal of information in respect to the countries which they had visited, and Caesar called together as many of them as he could find, when he had reached the northern shores of France, to inquire about the modes of crossing the Channel, the harbors on the English side, the geographical conformation of the country, and the military resources of the people. He found, however, that the merchants could give him very little information. They knew that Britain was an island, but they did not know its extent or its boundaries; and they could tell him very little of the character or customs of the people. They said that they had only been accustomed to land upon the southern shore, and to transact all their business there, without penetrating at all into the interior of the country. [Sidenote: Volusenus.] Caesar then, who, though undaunted and bold in emergencies requiring prompt and decisive action, was extremely cautious and wary at all other times, fitted up a single ship, and, putting one of his officers on board with a proper crew, directed him to cross the Channel to the English coast, and then to cruise along the land for some miles in each direction, to observe where were the best harbors and places for landing, and to examine generally the appearance of the shore. This vessel was a galley, manned with numerous oarsmen, well selected and strong, so that it could retreat with great speed from any sudden appearance of danger The name of the officer who had the command of it was Volusenus. Volusenus set sail, the army watching his vessel with great interest as it moved slowly away from the shore. He was gone five days, and then returned, bringing Caesar an account of his discoveries. [Sidenote: Caesar collects vessels.]