Let me alone, I have yet my legs left, and one arm. Tell the surgeon to make haste and get his instruments. I know I must lose my right arm, so the sooner it is off the better.
Source, in full
After being wounded during the attack on Santa Cruz de Tenerife (24 July 1797), as quoted in The Dispatches and Letters of Vice Admiral Lord Viscount Nelson with Notes (1845) edited Nicholas Harris Nicolas, Vol. II: 1795-1797, p. 423