https://parkplanning.nps.gov/documentsList.cfm?projectID=86259
ParkPlanning - Repairs to the Fort Jefferson Counterscarp and Dredging of Selected Areas
to thefort jefferson
https://www.merriam-webster.com/dictionary/counterscarp
COUNTERSCARP Definition & Meaning - Merriam-Webster
The meaning of COUNTERSCARP is the exterior slope or wall of the ditch in a work of fortification.
definitionmeaningmerriamwebster