armed forces
background
barrier
battle
black
border
cage
chains
combat
conflict
crime
danger
dangerous
drawing
edging
fence
forbidden
freedom
give
graphic
guard
illustration
iron
isolated
isolation
line
metal
painting
pattern
pick
plectrum
pointed
prison
private
protect
safe
security
sharp
shrill
silhouette
single alone
steel
structure
thorn
warfare
warn
white
wire