Ken --
Miss Wright assumed that the Confederate graves near what is now the Atoka County Historical Society Museum north of town were there as a result of the battle -- rather than the result of an outbreak of measles or cholera or dysentery or whatever.
At least that is what she personally told me when I was fairly new at the OHS and was in daily discussions (actually daily "listening sessions") with her about history in the Choctaw nation.
Ralph