Related Clues:

• Checkpoint Charlie shout
• Sentry's shout
• Sentry's call
• Sentry's "Stop!"
• ''Stop right there!''
• Be hesitant
• Obey a sentry
• What things may grind to
• Go no further
• Come to a standstill
• Sentry's directive
• Drill command
• Perimeter command
• Sentry's word
• ''Don't take another step!''