To get all of the 'official' executions straight in NE Missouri in the Fall of 1862:
15 men were executed on August 7, 1862 at Kirksville - the day after the battle there (by McNeil).
1 Man (Col. McCullough) was executed on August 8, 1862 at Kirksville (by McNeil).
3 men were scheduled to be executed at Mexico on September 5, 1862, but none were (by Merrill).
11 men were scheduled to be executed at Macon on September 26, 1862, but 10 were (by Merrill).
3 men were also scheduled to be executed at Huntsville on September 26, 1862, but only 1 was (by Merrill).
10 men were executed at Palmyra on October 18, 1862 (by McNeil).

(These do not include the various one or two shot down - by both sides - in the back woods.)
Craig