5 August 1388, or 19 August (according to English sources) The Battle of Otterburn, part of the continuing border skirmishes between the Scots and English.

CHEVY CHASE, and   THE BATTLE OF OTTERBURN contain parallel biographical and historical information.

The Ballad of Chevy Chase from Wikipedia     https://en.wikipedia.org/wiki/The_Ballad_of_Chevy_Chase
Facsimile copies of The Ballad of Chevy Chase from the English Broadside Ballad Archive of the University of California, Santa Barbara    http://ebba.english.ucsb.edu/search_combined/?ss=chevy+chase
Many recordings of “Chevy Chase” on YouTube     https://www.youtube.com/results?search_query=the+ballad+of+chevy+chase+song
   

Battle of Otterburn from Wikipedia     https://en.wikipedia.org/wiki/Battle_of_Otterburn
The Battle of Otterburn (Border Reiver Ballad) - Ungern Sternberg     https://www.youtube.com/watch?v=VndRwoAMWyY
“The Battle of Otterburn” from Mainly Norfolk     https://mainlynorfolk.info/june.tabor/songs/thebattleofotterburn.html
Many recordings of “The Battle of Otterburn” on YouTube     https://www.youtube.com/results?search_query=the+battle+of+otterburn+song