A Tale Of Two Soldiers

Towards the Northern end of Beverley town centre lies the old and impressive church of St Mary's.
Along the Southern wall, there is an inscribed tablet set into the stonework.
It appears to tell the tale of, possibly, a military duel and the consequences thereof?
Some of the letters haven't stood the onset of time and weather too well but, from what I can make out, it reads......

"Here two young (?) soldiers lye
The one in quarrel chanced to die
The others head by their own law
With sword was sever'd (??) blow

December the 25'd 1689"