The most trying difficulty was that of crossing streams, which were more numerous than they had supposed. Some were mountain torrents of only a few yards width, others deserved the name of rivers, and the current of each was of icy coldness. More than once they saw blocks of ice grinding and tumbling over one another as they plunged rapidly onward. It was so dangerous at times for the horses to attempt to swim across, and so hard and disagreeable for the youths, that hours were spent in hunting for a fording place. Fortunately they were always able to gather enough fuel to make themselves comfortable at night; grass became more plentiful and no trouble was had in procuring game. This generally consisted of bison, but it was a great improvement when they were able to bring down a Rocky Mountain sheep. This animal does not bear wool, but hair like that of the deer, and is larger than the largest domestic sheep. The horns of the males attain great size, starting from just above the eyes, though not touching at the bases, and curving over so as to include all the space between the ears. The meat at certain seasons is very palatable and held in high favor. The animal is generally known by the name of the "big horn," and is so skilful a climber and so alert that it is quite a feat for a hunter to bring down a specimen. Deerfoot was the only one on this return journey who was able to bag the game, which never failed to elude George and Victor Shelton. CHAPTER XXII. A MEMORABLE MEETING. If you will examine the map of the State of Montana you will note that the central county bears the name of Fergus, while one of the counties lying directly south is Yellowstone. The boundary between these two is the Musselshell River, which, flowing directly northward, separates Custer and Dawson counties, joining the Missouri at the northeastern corner of Fergus County. It was in the latter part of May, 1805, that Deerfoot and the two Shelton boys, after a long, wearisome ride and tramp through a wild and unknown region, broken by mountain spurs and crossed by numberless streams, arrived at the mouth of the Musselshell. Even with summer hardly a fortnight off, ice formed at night, flurries of snow filled the air at times and the camp fire became a necessity. And yet our friends were plagued by mosquitoes, grass was plentiful, and there was no lack of game. The party seemed to be sharing the summer and winter seasons, with the most disagreeable features of both. Having followed the Missouri so far, Deerfoot said that a crossing place must be found before the morrow, for it was inevitable that the farther they went down stream the larger it would become, because of its numerous tributaries. The Missouri was an eighth of a mile across at its junction with the Musselshell, but its current was gentle. Not an Indian had been seen for four days, and Deerfoot was on foot searching the northern shore for a good crossing place when George Shelton called out: