Bunkers in foregrounds are for artillery ammunition  storage.  Because NVA 120mm mortar gunners sometimes used delay- fuses, bunkers were dirt- over-timbers and capped with ammunition  boxes.  The top boxes were filled with rocks to force the fuze to  burst, the lower-layer boxes were empty to absorb the force of the  explosion.  Over time, we learned to replace the top layer of boxes  with empty 105mm shell casings with the closed end facing up.  The  casings were brass, and we found that the brass tended to tear in an  explosion rather like a banana peel rather than break off in shards,  whereas the rocks and boxes produced considerable secondary  shrapnel.  Hardening of the ammunition bunkers was critical because  we had huge numbers of high-explosive rounds mixed in with a lot of  troops on a very small hill.  Although there were several impacts on  the bunkers, none was ever penetrated.

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