Whoa, buck. Different Flower. The original thread & I assume GuestSteve's question is re "The Flower of Scotland," by Roy Williamson. See the two links above.

Yes, I'm fairly confident that it is re Wallace defeating Edward's I army (Ed wasn't there) a few years earlier on Sept. 11, 1297 at Stirling.   'Bout the only Ed this could be about except my friend Ed who invaded Scotland to sing some folk songs four years ago. He didn't exactly have an army, just a few friends.

The ansewers relate to "Floo'ers of the Forest" re Flodden. That was also a Fine Flower, though and I sang that one just this week to commemorate.