War of the Thorns Battle of Chelwood Common

21 June 1471: Edward IV defends against a Scottish Isles invasion in the south.

Actual events:
In February 1462 representatives of John of Islay, Earl of Ross concluded with Edward IV of England the Treaty of Westminster-Ardtornish, that envisaged nothing less than the conquest and partition of Scotland. The treaty was remarkably vague, saying nothing about the nature, scale and timing of English support. For Edward it was a diplomatic coup and it should have been perfectly clear that Edward was trying to create a diversion. Sadly for John it was not.

Even before the agreement was concluded the Islemen took to arms, advancing eastwards under the command of Angus Og, John's illegitimate son. The rebellion had the desired effect. The Scottish government, faced with rebellion in the north, and fearful of attack in the south, dropped the politically embarrassing Lancastrian connection. John, presumably now aware how worthless the Westminster agreement truly was, backed down.

Where things diverge:
With Edward IV back on throne in England, but weakened due to war, John saw his chance to seek revenge. He sailed with his large fleet and landed at Newhaven, marching north to London. Edward faced him on the fields of Chelwood Common.

Final result was Daniel (Y) 4 v 3 Lyle (L).