From the memoir of Father Paul Ponziglione. There is much more about John Mathews but I found this interesting about Watie in person being on the raid.

Now Osage Mission has become a great rendezvous for warlike, expeditions. One day were are visited by Union Troop, and on the next by Confederacy. Some times both parties happen to call on us the same day. One night a few cavalry men, belonging to a detachment of Wisconsin Volunteers camping on the banks of Flat Rock, quite near us, overtake a party of Confederates who are on the point of stealing our horses. The noise of the troops, who in the stillness of the hour, are galloping up the hill to our defense, comes so unexpected to the Knight of the White Feather (as the guerillas were called) that they at once abandon their pray, just by the stables door, and run for their life. Bothe parties are for a while chasing one another in the dark over the prairie west of the mission, exchanging few shots, but once the Confederates reach the timber belt, which runs along the Neosho, the Wisconsin boys learning that they might be derived into some snares, give up the pursuit and return to their camp.

On the 8 of September a body of about 200 Confederates under the lead of Colonel Stand Watie, a Cherokee half-breed and two white men acting as Captains, Mr. Livingston and Mr. John Matthews, came to pay us a visit just at 2 o’clock p.m.. We felt a little uneasy at their appearance, for thought it was Sunday, we know very well, that they were no coming to attend at Vespers. But the 3 officers of this band did not intend to give us any trouble. In fact calling on us, they assured us of their esteem and tell us that we need not fear anything. For they were going to have a meeting with the Osages, at the residence of Mr. Joseph Swis (?), four miles father west, and at the same time they would take part in the wedding feast of Mr. Louis Chouteau, who had just married a Cherokee young lady.

So the were saying, but the real object of their expedition was to make a raid on the town of Humboldt in Allen County, to retaliate for damages the Union men had inflicted on them in west Missouri. The went to camp for the night at the old crossing of Four Mile Creek, due west of our mission, and to leave, as it were, a mark of having been there, about day light of the next morning they hung a poor white man, a stranger, who happened to fall into their hands during the night. This done, they started at full gallop for Humboldt. They took the town by storm, and no wonder, for most all the men able to carry arms, were out in Missouri under command of General T. H. Lane. Meeting with no opposition, but rather with full success at every step, they kidnapped a few Negros, plundered several stores, and houses of all the valuable they could find and satisfied with their booty, hurried out of town that night, with their captives.
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