Statistics for occurrence #1 of “General McClellan” in chapter 6, page 201 of William Swinton, Campaigns of the Army of the Potomac:

...e he would be called upon to meet the Union army. But this expectation was disappointed, and all Lee's plans for ulterior operations in Maryland were thwarted by a piece of good fortune that befell General McClellan at this time. There accidentally fell into the hands of the Union commander on the day of his arrival at Frederick a copy of Lee's official order for the above movements of his troops, whereby his ...
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