Devil's Den (English Wikipedia)

Hunt, Henry J. The Second Day at Gettysburg… (Civil War Reference transcript). Retrieved 2011-10-22. A cross-road connecting the Taneytown and Emmitsburg roads runs along the northern base of Devil's Den. From its Plum Run crossing to the Peach Orchard is 1100 yards. For the first 400 yards of this distance, there is a wood on the north and a wheat-field on the south of the road, beyond which the road continues for 700 yards to the Emmitsburg road along Devil's Den ridge, which slopes on the north to Plum Run, on the south to Plum Branch. [Rose Run] … The angle at the Peach Orchard is thus formed by the intersection of two bold ridges, one from Devil's Den, the other along the Emmitsburg road{{cite book}}: CS1 maint: deprecated archival service (link)

clarkpark.info (Global: low place; English: low place)

Collins, Jaffe; et al. (April 2001). Clark Park Revitalization Project (PDF) (Report). Philadelphia, Pennsylvania: Friends of Clark Park / University City District. p. 5. Archived from the original (PDF) on 2011-07-19. Retrieved 2010-09-22.

Groves, James C. (1998). "The Devil's Den Sharpshooter Re-Discovered". JamesCGroves.com. Retrieved 2011-10-24.

"Famous Snake" (Google News Archive). Gettysburg Times. Times and News Publishing Company. Jan 23, 1932. Retrieved 2011-03-15. In September, 1881, the shy blacksnake of Round Top was seen by Hiram Warren, who states his length to be fifteen feet. For over a quarter century this reptile has been known to reside in this neighborhood—it was named 'The Devil', and the place assumed to be its den became "The Devil's Den.
"Little Round-Top" (Google News Archive). Gettysburg Compiler. October 24, 1899. Retrieved 2011-10-24. Just before Gen. Crawford made his charge … Gen. Weed said to me: 'Martin, I would rather die on this spot than see those rascals gain one inch of ground. I … started to go down…and saw…Weed, reeling and falling to the ground. … [from] Little Round Top … Rittenhouse had a perfect enfilading fire into Pickett's right flank and used it to the best possible advantage.

Brown, Andrew (2006) [1962]. "GEOLOGY and the Gettysburg Campaign" (PDF) (Eleventh printing ed.). Pennsylvania: Bureau of Topographic and Geologic Survey. Archived from the original (PDF) on August 18, 2000. Retrieved 2010-02-19.

Brown, Andrew (2006) [1962]. "GEOLOGY and the Gettysburg Campaign" (PDF) (Eleventh printing ed.). Pennsylvania: Bureau of Topographic and Geologic Survey. Archived from the original (PDF) on August 18, 2000. Retrieved 2010-02-19.
Collins, Jaffe; et al. (April 2001). Clark Park Revitalization Project (PDF) (Report). Philadelphia, Pennsylvania: Friends of Clark Park / University City District. p. 5. Archived from the original (PDF) on 2011-07-19. Retrieved 2010-09-22.
Cope, Emmor, "Devil's Den - Cast Iron Site ID Tablet", (structure ID 73, LCS ID tbd) List of Classified Structures, National Park Service, archived from the original on 2013-12-11