Statistics for occurrence #1 of “Chester gap” in chapter 18, page 323 of Maj. Jed. Hotchkiss, Confederate Military History, a library of Confederate States Military History: Volume 3, Virginia:

...rom the vicinity of Jeffersonton, to which he fell back in giving place to Longstreet, Jackson marched for some distance to the northwestward, along the great highway leading to the Valley, by way of Chester gap , and his bronzed veterans were elated with the conviction that they were again bound for the scene of their victories of the preceding spring; but, when a short distance beyond Amissville, their cour...
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Entity Corpus Doc Corpus Doc  
Chester Gap (Virginia, United States) 337 18 5 0 0 user votes

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