Buffalo Hump, Yellow Wolf and Santa Anna were by then the most important war leaders of the Penateka Comanches, and in 1838, when Buffalo Hump accompanied the peace chiefs Mukwooru, Amorous Man, and Old Owl to meet Texan President Sam Houston in Houston city, where they subscribed a treaty; Yellow Wolf and Santa Anna remained in charge of the warriors, to ensure the security of the delegation, and everyway the leadership of the warriors, in case of treachery.
A Comanche delegation (65 people, with a dozen chiefs of several bands and several women too), led by Mukwooru and Kwihnai ("Eagle") came under a white flag of truce as they understood ambassadors should do.
The Texans did not understand the chiefs had no power over the other bands to force them to comply with the demands, and pulled out guns telling the Indians they were now their prisoners until the rest of the white captives were returned.
Volunteers from Gonzales had gathered to attempt to stop the war party and together with all the ranger companies of east and central Texas, moved to intercept the Indians, which they did at Plum Creek, near the city of Lockhart on August 12, 1840.
80 Comanches were reported killed in the running gun battle (although only 12 bodies were recovered), unusually heavy casualties for the Indians, although they got away with the bulk of their plunder and stolen horses.
[5][6] When, in ratifying the Tehuacana treaty, the Senate of Texas Republic erased the reference to the Comancheria borders, the Texan bad faith and Yellow Wolf and Santa Anna's suspicions were confirmed, so Buffalo Hump aligned with his cousin, who had proved himself to have been more realistic than the major leader in evaluating the white man's concern for a fair and lasting peace, and the third war chief, and denounced the Tehuacana treaty and resumed hostilities.
[2][5] Annexed Texas to the United States, in May 1846 Buffalo Hump, Yellow Wolf and Santa Anna, aware they weren't strong enough to oppose U.S.A. nor stop the ceaseless and massive flow of the immigrants, agreed to meet the U.S. delegates at Council Springs and signed a new treaty;[7] Buffalo Hump declined an invitation to go to Washington and meet President James Polk, and joined Yellow Wolf in a great raiding party going to Mexico.
[8] White men encroaching in “Comancheria” provoked clashes and, on November 16, 1850, Yellow Wolf led 100 Comanches to raid a wagon train at Cherry Spring, fourteen miles northwest of Fredericksburg: four teamsters were killed and three wounded.
Randolph B. Marcy carried out a reconnaissance and located two areas, allocating to the Penatekas 18.576 acres on the Brazos Clear Fork, approximately five miles from Camp Cooper.
In November Neighbors went to the Penateka winter camp and persuaded Buffalo Hump and the far more malleable Shanaco, Ketumse, and Asa-havey to go and settle in the reserve, but Yellow Wolf, who was still pressing for the recognition of a border between Texas and Comancheria, left the council, flatly refusing to go.