Resumed the march on June 30th, and forded the Sheyenne River on the 4th of July, camping a little beyond it at a spot three-quarters of a mile northeast of the two mounds called "The Bowshot" and in the neighborhood of where the fight occurred about forty years before between the Pawnees, Shawnees, and Sheyennes, which, as I am informed, resulted in the annihilation of the last-named tribe. At this place,—named Camp Hayes,—70 miles distant from Camp McLaren, the expedition lay six days, awaiting the supply train, which arrived on the 9th. Resumed the march on the 11th, on which day Lieutenant Exel left on furlough. The 12th was spent in camp. The second crossing of the Sheyenne was made on the 17th. On the 18th arrived at two lakes named Jessie[2 ] and Leda, 90 miles from Camp Hayes. An entrenched camp was established on the banks of the former (the more easterly one of these two lakes) which was about three miles long. The camp was called Atchison, and a day and one-half were spent there in making arrangements for a vigorous pursuit of the Indians. Companies C and G of the Sixth were stationed there as a part of the garrison, and five of the company were left behind there, viz.: Seidel, Eberdt, and Jakobi, as members of the band, and Kraemer and Reuter, who were too sick to travel.

On the 20th, all the arrangements having been completed, the expedition began a more rapid advance in pursuit of the enemy, and on the 24th of July, 89 miles from Camp Atchison was fought the battle of "Big Hills" or "Big Mound." As soon as it was known that the Indians were in force, the train was corralled on the margin of a small lake, Big Mound being directly to the eastward and distant about one and one-quarter miles. The Sixth Regiment with one company of Mounted Rangers and a section of artillery occupied the east front, and threw up a line of earthworks for protection. As soon as the attack began, Colonel Crooks at once deployed Companies E, I, and K of the Sixth and A of the Ninth, under Major McLaren, as skirmishers, and they pursued the Indians two and one-half miles. Three companies of the Sixth were also deployed on the left flank, and the Indians were repulsed at that point. Major McLaren with companies A, B, D, I, and K advanced four miles at a double-quick, having been ordered to support the troops already at the front, but on their arrival they were ordered to return to camp.

On the 25th the expedition moved only about five miles to a better camping place and remained there on account of the jaded horses. On the 26th, with the Sixth Regiment in advance, the march was resumed. On arriving at Dead Buffalo Lake, some 15 miles from the last camp, the Indians again appeared in force and commenced an attack. Colonel Crooks immediately deployed a part of the Sixth, including Company E, as skirmishers, under Lieutenant Colonel Averill, and they advanced steadily, driving the enemy as they went; the remainder of the regiment under Major McLaren being held in reserve. After an advance of about one and one-half miles Major McLaren with five companies of the Sixth was ordered to return to the camp at the lake, three companies remaining at the front. Desultory firing was kept up until about 3 p.m., when the Indians made a final assault, which was repulsed in fine style by the troops under command of Major McLaren. The Indians, having been defeated at every point, now withdrew from the field.

On the morning of the 27th the advance was again resumed, and in the afternoon a camp was formed on Stony Lake. On the 28th, as the troops were forming in column, the Indians again appeared and made their last charge. About one mile beyond the lake the Sixth Regiment was deployed to skirmish on the right of the train, and they repelled the attack of the Indians who threatened it. The firing continued for a time, the Indians finally making a rapid retreat in the face of the advancing expedition. The pursuit was continued until Apple River was reached, where a camp was formed for the night.

On the 29th the army crossed Apple River, continuing the pursuit, and in the afternoon the Missouri River was reached, the regiment, under the immediate command of Colonel Crooks, skirmishing nearly two miles through the woods to it. The Indians having crossed to the west bank and hoisted white flags, the battery which had been advanced, and was in good position for shelling, was moved away, as the policy seemed to be to kill Indians only when they made an attack. Many of the skirmishers ventured to the river bank and began filling their canteens, when suddenly the enemy fired at them from the other side and the men were forced back, but not without sending a volley in return. A camp was formed on the banks of the Missouri River near the mouth of Apple River. The point on the river struck was in about 46° 40′ north latitude, 600 miles from Fort Snelling by the route followed, 6 miles above the mouth of Apple River, and 85 miles from the Big Mound.

On the 30th Colonel Crooks with Companies A, I, and K and details of men from other regiments, proceeded to the Indian crossing, and destroyed all the wagons and such other property as would be of service to the Indians, and then returned to camp.

The return march began on the 2nd of August. The 5th and 9th of the month were spent in camp. Passed to the southward of the outward journey, shortening the route some thirty miles, and arrived at Camp Atchison on the 10th. Rested on the 11th. Reached Sheyenne River on the 13th, and camped three miles beyond it.

At this last place the nightly entrenching, commenced on departure from Camp Pope, was abandoned, the impulse of discontinuance coming from Company E. It had been the custom, both in the campaign of 1862 and this, to throw up every evening light exterior mounds and ditches for defense, a work necessarily irksome and unpopular with men fatigued with hard marching, and in the presence of an enemy (and some times not) they neither respected nor feared. The traces of these works, slight as they were, will be visible for years, and if properly noted by the surveyors of the public lands as the surveys extend westward, and by future Pacific Railroad parties, will furnish means for exactly determining the routes of the two expeditions; certainly as regards that of 1863, which lay through trackless wastes, over which not even an odometer passed with this expedition. It is to be regretted that the commanding officer of the expedition, lavish as were the expenses attending it, thought fit to negative a proposition made to form a quasi-topographical force for its use. Such a proposition would have involved no other expense than that of a few simple instruments for the use of the surveyor and his assistants (enlisted men) who might be detailed, and their labors would have furnished valuable material for the maps which were afterwards ordered to be constructed, besides contributing to the interests of geographical science in general.

The 16th and 18th of August were spent in camp. Reached Fort Abercrombie on the 21st and camped on the west side of it; distance from Camp Atchison about 115 miles. Remained at the fort three days. Here Klinghammer rejoined. Resumed march on the 25th. Spent the 30th in camp. Arrived at Sauk Centre on the 2nd of September, and remained there all the next day. Here Rehse was left behind, sick. At this place the expeditionary forces were divided, the Sixth Regiment being ordered to Fort Snelling. We left Sauk Centre on the 5th; and spent the next day in camp. The route was by the way of St. Joseph, St. Cloud, and Anoka, and the neighborhood of the fort was reached on the 12th; the return route from Apple River being about 510 miles.

John and Scher rejoined on arrival at the fort, and Seidel, Eberdt, and Jakobi were relieved, the band being temporarily suspended. Corporal Eheim was sent to the hospital on the 18th.