Finally, annexed Texas to the United States, in May 1846 Buffalo Hump led the Comanche delegation to the treaty talks at Council Springs, that signed a peace treaty with the United States, and Yellow Wolf and Santa Anna, aware they were no longer strong enough to oppose U.S.A. nor to stop the ceaseless and massive flow of the immigrants, were with him; the Comanches agreed to meet the U.S. delegates and signed a new treaty; Buffalo Hump, nevertheless, declined an invitation to go to Washington and meet President James Polk, and joined Isaviah in a great raiding party going to Mexico. In 1847 some Penateka chiefs (Mupitsukupʉ, Buffalo Hump, Santa Anna, but, apparently, not Yellow Wolf) met the Indian agent Robert S. Neighbors, Johann O. von Meusebach and the German immigrants united in the “Adelsverein” in the San Saba River council, and authorized them to settle Fredicksburg, in the grant the Germans had bought between the Llano and the Guadalupe rivers. Still in May 1847 Pahayuca, Mupitsukupʉ, Buffalo Hump and Santa Anna met again Neighbors only to apprehend that U.S. Senate had suppressed the article of Council Springs treaty forbidding the white people to encroach in the Comanche territory: among their useless protests by the chiefs, Santa Anna claimed the right to raid into Mexico, and, being the United States at war with Mexico, Neighbors didn’t raise any objections, so Buffalo Hump, Yellow Wolf, and Santa Anna led some hundreds warriors into Coahuila and Chihuahua, burning villages, stealing horses and kidnapping women and children all the way to San Francisco del Oro during the summer; coming back, the Comanches were engaged by U.S. Dragoons near Parras, losing part of the booty; in august Yellow Wolf, Buffalo Hump, and Santa Anna were in Mexico again leading 800 warriors.