Mayhaps.
Overall, I think the issue is that the 400 men are going to be going through mountain passes, which means they are strung out in a line and vulnerable to ambush from above.
Could the Blackfish hitting Hoster Tully’s pyre, a small, moving target, from several hundred metres away be a Chekhov’s Gun? Edmure is currently headed for Casterly Rock, escorted by 400 heavily armed men. The BwB would probably have trouble defeating them in a pitched battle, unless they were to be ambushed at a choke point by a group of highly skilled archers…
Published
RFTIT Tumblr Backup 