On the evening of the arrival of the expedition at Big Island Grove, Major Williams decided that since they were evidently in the Indian country the march should thereafter be made with more caution. Accordingly, he called for volunteers for an advance scouting party of ten men whose work would be to precede the main expeditionary force and keep a sharp look-out for the near approach of Indians and to observe, interpret, and report any signs that might be discovered. They were to maintain an advance of perhaps three miles over the main column. Major Williams selected as the commander of this advance guard William L. Church, who of all the members of the expedition was the most familiar with the country in which they were now moving, since he had passed through it a number of times after settling at Springfield. Those who had volunteered as his companions were Lieutenant Maxwell, Thatcher, Hathaway, F. R. Mason, Laughlin, A. S. Johnson, De Foe, Carpenter, and another man whose identity seems to have been forgotten shortly after the return of the expedition to Fort Dodge.[251]
The members of the advance guard were astir early Tuesday morning; and while they breakfasted, rations for three days were made ready for each man. These rations when totalled amounted to forty pounds of corn meal and twenty pounds of wheat flour. In addition the men were allowed each a piece of corn bread about six inches square, which was supposed to be divided among the meals of the succeeding three days; but a number of the men, deciding that the easiest way to carry the bread was to eat it, immediately set about doing that very thing. The scouting party left the main body of the expedition about six o'clock on a beautiful winter's morning--although it was in fact the closing day of March. Orders were given to the men to scout north, northwest, and northeast of the route to be followed by the main body. Lieutenant Maxwell and Laughlin, being true plainsmen, took the lead, while the remaining eight were soon envying "the ease and celerity with which" they "with their long legs and wiry frames, pulled through the snow and across the snow-drifts".[252]
The advance had made about twelve miles when the men paused on the bare ridge of the Des Moines water-shed for the mid-day meal. Mason was stationed as sentry, while the others ate in the sheltered lea of the ridge. At some distance from the other members of the party, Mason had been at his post only a short time when he saw far to the northwest a black spot come into view. It soon became evident that the spot was moving. The attention of the other members of the party was called to the discovery. After sighting with their ramrods for some minutes, they too concluded that the object was really on the move. Furthermore it was agreed that the moving object must be a party of Indians; and so an attack was planned.