[Rubitin]

go read the history properly

British attacked Nepal, but British casualties were very high, so the British convinced the Gurkhas to stop fighting and sign an allied treaty to work together. 

Then the British enlisted the Gurkhas into east india armies and make use of the Gurkhas to unite the whole India.

Just imagine the fearless Gurkhas + British guns in the 1800 era = invincible army

Basic rule of humanity.
'Fearless is limitless'. 
Gurkhas is also human not robot. maybe they understood sooner or later we, one by one will have to die.