reconnaissance behind enemy lines

go behind enemy lines

get behind enemy lines

stealth sneaking behind enemy lines

man behind the man behind the gun

cut behind the enemy

exterior lines (див. interior lines)

interior lines (див. exterior lines)

roll up enemy lines

lines open to the enemy

gaps in the enemy lines

stay-behind (operations)

stay-behind ambush

stay-behind force

moving force behind

falling behind

wake of boundary layer behind an aerofoil

cut behind defenses

fall behind time

crouch behind cover

overwhelm an enemy / overwhelm the enemy

counter reconnaissance / counter-reconnaissance

air lines of communication (ALOC)

disruption of lines of communication

electric power lines

friendly lines

ground lines of communication (GLOC)

gun lines

in the lines

interior lines of communication

interval of grid lines

lines of communication (LOC)

lines of withdrawal