As a preliminary step, it was decided that mounted men from the several outfits that were to cross should test various parts of the river by different routes. Stripping the saddles from their horses, those who were willing to attempt the passage started in from as many different points. For two or three rods in each course tested, the water was found to be rather shallow, but further on it varied greatly along the different routes. The water being muddy, there was no visible indication of its depth in advance of the rider, except that at the deepest points the current, being less impeded, was much swifter and was also indicated by broad, undulating swells. When about one-fourth of the way over, my horse dropped into a very deep channel, where he could obtain no footing. In all such places, the horse and rider swiftly drifted down the river, swimming in the direction of the objective point on the opposite shore. Nearly all of those who participated in this preliminary trip seemed to doubt the practicability of a safe crossing. The rider, however, who had kept the furthest up the stream had found a footing for his horse through nearly the entire course, there being but one place where for a moment he seemed to lose his hold on the bottom; and that was approximately the route adopted. The tendency of all who crossed, was to be carried down the stream, and all came out on the north bank a long distance below the point which they aimed to reach. A trigonometrical measurement of the river, taken with a sextant, gave the width as 792 yards; Root gives the width as being one-half mile. But our proposed course, being serpentine and quite in the form of the letter S, was about seven-eighths of a mile in length. The general course having been agreed upon, the final preparations were quickly made for the start. As oxen are the safest animals to use in this kind of work, it was arranged that the ox team wagons should move in advance. Eighteen yoke of oxen--in other words, the teams from three wagons--were hitched to a single wagon, each making a combined team more than 200 feet in length. Four such teams were made ready. The heaviest men were assigned to ride on the backs of all the lead oxen, to bear them down as low as possible into the water, so that they would be less inclined to float in deep water and lose their footing. Oxen in swimming do not sink as low in the water as either mules or horses. The instructions to the drivers of all teams were to direct them constantly somewhat up stream, that they might eventually reach the opposite shore as nearly as possible directly opposite the place of starting, for they would be sure to drift more or less.