哀兵必胜

an army burning with righteous indignation is bound to win (idiom)

Ai (c. 2000 BC), sixth of legendary Flame Emperors 炎帝[Yan2 di4] descended from Shennong 神農|神农[Shen2 nong2] Farmer God, also known as Li 釐|厘[Li2]

sorrow; grief; pity / to grieve for; to pity; to lament; to condole

soldiers / a force / an army / weapons / arms / military / warlike / CL:個|个[ge4]

certainly / must / will / necessarily

to be certain of victory / to be bound to prevail

victory / success / to beat / to defeat / to surpass / victorious / superior to / to get the better of / better than / surpassing / superb (of vista) / beautiful (scenery) / wonderful (view) / (Taiwan pr. [sheng1]) able to bear / equal to (a task)