A DROP OF NELSON’S BLOOD
After his victory at the Battle of Trafalgar, 21 October 1805, Nelson's body was preserved in a cask of brandy, or rum, to allow transport back to England. ‘Nelson's blood' became a nickname for rum.

A Drop of Nelson's Blood from Wikipedia    https://en.wikipedia.org/wiki/A_Drop_of_Nelson%27s_Blood
Many recordings of ” A Drop of Nelson's Blood “ on YouTube     https://www.youtube.com/results?search_query=A+Drop+of+Nelsons+Blood

Link to DEATH OF NELSON by J. Braham & S. J. Arnold posted above by Ged Fox