abri
angle
approach trench
brew
bunker
cabal
collude
communication trench
complot
concoct
connive
conspire
cook up
counterplot
counterwork
coupure
ditch
double sap
dugout
engineer
entrenchment
finagle
finesse
fire trench
flying sap
fortified tunnel
fosse
foxhole
frame
frame up
gallery
hatch
hatch a plot
hatch up
intrigue
lay a plot
machinate
maneuver
mine
moat
operate
parallel
plot
rig
sap
scheme
slit trench
trench
tunnel
countermeasure
countermined
countermines
countermining
man-eater
selene's
tentacula