In consequence of the lateness of the arrival of these companies at Fort Gibson, and a variety of unforeseen difficulties in obtaining the proper arms and equipments for the regiment, the movement to the west was delayed until the 15th of June. In the mean time, General Leavenworth, who had been appointed to the command of the troops on the western frontier, south of the northern boundary of the State of Missouri, detached one company of that regiment as an escort to the caravan of traders to Santa Fe, in Mexico. He also employed detachments of the third and seventh regiments of infantry in opening roads between the posts on the Arkansas and Red rivers, and in establishing new posts beyond the settlements of the emigrated Indians, for the purpose of facilitating the movements of the expedition, and covering the country occupied by those Indians, in the event of a failure to secure a friendly intercourse with the wild tribes inhabiting the country beyond them. These arrangements having been made, the expedition, consisting of nine companies, under Colonel Dodge, was put in motion, accompanied by a deputation from the several tribes of friendly Indians, to act as guides and interpreters, and to aid in bringing about a general good understanding between the several nations; and in order that the friendly intercourse might be further promoted, two Indian girls, the one a Pawnee, and the other a Kiowa, who had been captured by the Osages, also accompanied the expedition for the purpose of being delivered to their friends. Owing to the sickness which prevailed among the troops, the command, on reaching the river Washita, about one hundred and eighty miles west of Fort Gibson, was so much reduced as to render a re-organization of the companies necessary. Colonel Dodge accordingly, out of the effective force, formed six companies, each forty-two strong, and, under instructions from General Leavenworth, continued his march to the Pawnee village, situated on a branch of the Red river. Here Colonel Dodge held a council with the Camanches, the Pawnees, (or Toyaslas,) the Kiowas, and the deputation of Indians which accompanied him, amounting in all to about two thousand persons. He explained the object of the expedition, and was instrumental in bringing about a friendly intercourse between several hostile tribes. He also obtained the surrender of the son of a Mr. Martin, an American citizen, who had been murdered by the Indians, and of a black boy captured by them. A more particular account of the interview between Colonel Dodge and the assembled tribes will be found in the journal of the expedition, annexed to this report.