bunkers
Fortification chambers mostly below ground level built of reinforced concrete or similar material and usually provided with embrasures; also, dugouts that are reinforced (as with logs or bags of sand) and usually have firing slits.
Fortification chambers mostly below ground level built of reinforced concrete or similar material and usually provided with embrasures; also, dugouts that are reinforced (as with logs or bags of sand) and usually have firing slits.