The location of Armstrong Academy and roads leading to it in February of 1896 can be found in the USGS Land Survey given at:
http://www.glorecords.blm.gov/details/survey/default.aspx?dm_id=20358&sid=sbp1go3q.rjj#surveyDetailsTabIndex=1y
in Section 12 of T 6S, R 11 E.
The adjacent Armstrong Academy Cemetery, located just to the west of the academy, does not appear to be shown in the land survey.
Armstrong Academy was the Capitol of the Choctaw Nation from 1863 until the 1880's, Thus, this explains in part why at least two Grand Council meeting of 1864 were held at Armstrong Academy, including its good building facilities, and why MG Maxey was there away from his headquarters as MG Price entered Indian Territory from Cane Hill via Evansville, Arkansas on November 4, 1864.
At the time, only Spencer Academy near Doaksville had similar sizeable facilities convenient for Confederate Indian use in Indian Territory. However, the decision had already been made to move the Choctaw Capitol away from Doaksville and the closer Federal armies in Arkansas (now threatening the Choctaw Nation from Ft. Smith and Little Rock.), and closer to the major Confederate supply depot at nearby Bonham, Texas, which now supplied nearby Boggy Depot, IT. Boggy Depot was located along the Texas/Preston/Butterfield Roads and connected to the Doaksville Road and eastward to Washington, AR, the Confederate Capitol of Arkansas.