aggression
anti
antitank
army
barbed
barrier
battlefield
big
block
blockade
boundary
center
concrete
conflict
construction
death
defend
defense
fence
field
grass
grow
hedgehog
historical
history
invasion
iron
metallic
military
nature
nobody
object
obstacle
old
outdoor
protection
road
row
secure
steel
stop
street
tank
trap
war
weapon
wire
world