Statistics for occurrence #1 of “Confederate States” in chapter 5 of Brig.-Gen. Bradley T. Johnson, Confederate Military History, a library of Confederate States Military History: Volume 2.1, Maryland:

...a deadfall, for the soldier who attempted to hold it. It was commanded on the east by the Maryland heights beyond the Potomac, and on the south by heights on the other side of the Shenandoah. The Confederate States government was then offering every inducement for Maryland to join it. It exempted Maryland from its declaration of war against the United States, and it was tender of her territory and her feelings....
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