Kenneth, that page number is 133. This is the passage of particular interest:

"... The Federal provost mashal, Capt. William Wiles, certified that 265 Southerners were found on the field and buried by Union troops. ... "
Source: Cozzens, Peter The Darkest Days of the War: The Battles of Iuka and Corinth, 1997, University of North Carolina Press

Hope this is of some assistance in your quest.
-Chip