Statistics for occurrence #1 of “Colonel Slough” in entry united-states-of-america-new-mexico of Harper's Encyclopedia of United States History:

...y 27, 1861 Confederates under Gen. H. F. Sibley defeat the Federals under Colonel Canby at Valverde, 10 miles below Fort Craig......Feb. 21, 1862 Battle at Apache Cañon, near Santa Fe; Colonel Slough defeats the Confederates under Colonel Scurry......March 28, 1862 Santa Fe, in possession of the Confederates since March 11, 1862, is recovered by the Federals......April 21, 1862 Territory...
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