Note 122 — Chapter II · Defending the Line
Reading edition
The artillery regiment had earlier developed the “box-me-in” fires for outpost defense. If under heavy attack the outpost could call for these pre-planned close-in fires that completely surrounded the position. In event of radio or wire communication failures, the outpost could call for “box-me-in” or “Fire VT on my position” by signal flare or other pyrotechnic device. Henderson ltr II.