Recollections of EARLY TEXAS  (Memoirs of
John Holland Jenkins) Edited by John Holmes
Pgs. 20, 25 & 26

…Early in this year Col. James Neill, an old soldier
under Jackson, came from Alabama and settled
where old Mr. (Hugh King) McDonald now lives.  
His bravery and experience won for him a hearty
welcome in our midst, and he was of great service
to us in subsequent years….

…On this raid, Colonel Neill adopted a singular, if
not barbarous, method of sending destruction upon
the Indians.  Having procured some smallpox virus,
he vaccinated one of the captive warriors, and then
released him to carry the infection into his tribe!  
Nothing was ever heard as to the success or failure
of this project.