from The Century Dictionary.
- noun In fortification, the interior slope of a parapet.
from the GNU version of the Collaborative International Dictionary of English.
- noun The interior slope of a fortification, against which the garrison lean in firing.
Sorry, no etymologies found.
The sustained efforts of the enemy to shell them out with curved fire met with no success; and against direct artillery fire they seemed to be better sheltered than men in the fort who could be enfiladed more or less behind the breastheight.
When, therefore, in the evening a heavy and continuous bombardment of the pits and the space intervening between them and the fort commenced, it was evident what was coming, and the general drew out four companies (about 175 men) from the bomb-proofs and formed them behind the breastheight of the land force ready to go out of the right sally port by a flank when required.