What is the origin of the expression die hard?

Answer 1

The expression" Die Hard"originated from the battle of Albuhera on 16th May 1811.Forces from the British,Spanish and Portugese armies engaged the French Army at the Spanish village of Albuhera during the Peninsular War.
The 57th (West Middlesex) Regiment earned the nickname of the Die Hards from the battle of Albuhera,in one of the bloodiest battles of the war.The commanding officer of the 57th,Colonel Inglis,was struck down by canister shot which hit his neck and chest.He refused treatment and lay in front of his men calling on them to hold their positions and cried out "Die hard the 57th,die hard"
The casualties of the 57th were 422 out of 570 men in the ranks and 20 out of 30 officers.The Allied commanding General wrote "our dead,particularly the 57th Regiment,were lying as they fought in the ranks,every wound in the front."