Almost the first thing that Van Dorn did, after assuming command of the new military district, was to write,[577] from his headquarters at Jacksonport in eastern Arkansas, to Price, advising him that Pike would shortly be ordered to take position in southwestern Missouri, say in Lawrence County near Mt. Vernon, "with instructions to coöperate with you in any emergency." Van Dorn was then laboring under the impression that Pike's force consisted of a majority of white troops, three regiments, he thought, out of a brigade of eight or nine thousand men, whereas there was only one white regiment in the whole Indian department. Colonel Cooper complained[578] that this latter condition was the fact and insisted that it was contrary to the express promises made, by authority,[579] to the Choctaws and Chickasaws when he had begun his recruiting work among them the previous summer. Had Van Dorn only taken a little trouble to inquire into the real state of affairs among the Indians, he would, instead of ordering Pike to bring the Indian regiments out of Indian Territory, have seen to it that they stayed at home and that danger of civil strife among the Cherokees was prevented by the presence of three white regiments, as originally promised. At this particular time as it happened, Pike was not called upon to move his force; for the order so to move did not reach him until after the Federals, "pursuing General Price, had invaded Arkansas."[580] [Illustration: FORT McCULLOGH [_From Office of Indian Affairs_]]