Statistics for occurrence #1 of “Chester Gap” in chapter 10.71 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...gel's camp in the forenoon, the one moving across the North Mountain westward on the Moorefield road, and the other eastward through Front Royal, passing that town and taking the road leading through Chester Gap in the Blue Ridge. These facts convinced me that Sigel, before venturing to advance, meant to ascertain whether he had enemies in dangerous force within striking distance on either flank; an invest...
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Entity Corpus Doc Corpus Doc  
Chester Gap (Virginia, United States) 337 6 5 0 0 user votes

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