Assertion: fortress's defender | /r/CapableOf | engage in active countermeasures
Facets:
value: to keep control of the glacis
type: PURPOSE
Source sentences:
text: Defenders could move relatively safely in the cover of the ditch and could engage in active countermeasures to keep control of the glacis, the open slope that lay outside the ditch, by creating defensive earthworks to deny the enemy access to the glacis and thus to firing points that could bear directly onto the walls and by digging counter mines to intercept and disrupt attempts to mine the fort walls.