sandbag for protecting the enemy from invading front line. sandbag and bunker of the old military bunker base on the mountain

army asian barrier base battle battlefield bom border building bunker camouflage combat combatant conflict cover damage danger defense destroy enemy explosives fighter forest front frontline hill history hole insurgent invading line military mountain nobody old outdoors packaging perimeter pile protect protecting protection protective raw sand sandbag sandbags security soldier thailand used wall war warfare warrior