Famed for being so badass that after the Anglo-Nepalese war, the British signed a treaty so that the Gurkhas could join their army and fight for them instead.
The British Army still has Gurkha regiments to this day, along with the Indian Army. And they're still badass - if you want an example, check out Dipprasad Pun
"The three sounds the German solider hates most are the haka, for it means the Maori Battalions are coming, the bagpipe, for it means the Scottish Rifle Brigades are coming, and silence, for it means the Gurkhas are coming."