dùn​bīng

blunt weapons

钝兵 鈍兵 dùn​bīng
blunt weapons
blunt or dull weapons; weaponry that has lost its sharpness or effectiveness
demoralized soldiers
demoralized or exhausted soldiers whose morale and fighting spirit have been blunted
exhaust the troops
to blunt the sharpness or spirit of an army, typically through prolonged or ineffective military action