Statistics for occurrence #1 of “Mr. Allen Pinkerton” in chapter 4.14 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: Volume 2.:

...) and of the force of the enemy in front of Leesburg. In fact, at that time the organization of the secret service was entirely insufficient to the occasion, in spite of the praiseworthy efforts of Mr. Allen Pinkerton . McClellan, who was established beyond Dranesville with McCall's division, believed himself to be within supporting distance of Baker's brigade. The latter was crushed on the 21st, before any one ...
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