Ok so first we have our commander go out there alone and pretend to surrender. Let's assume they will send just a few men to capture him, and after he kills them they will keep sending men one at a time, just running at him so he can kill one just before another arrives even though they have no reason not to group up and overpower him. Oh and they do also have around 100 archers in a position designed to defend this battlefield, but let's just assume 498/500 shots will miss.
Ok so after that our commander should be wounded and lie down in cover from the archers, now easily killable by a single guy with a long stick right? Let's assume at this point they will send their entire army to stand around him menacingly. This is our time to strike. Let's assume no one in the enemy army thought about why we would send our commander there alone to fight them, while we sneak our entire army there. Thank the Seven no one in this universe has learned to prepare for these sneak attacks even though all battles seem to end in one.
Then we simply run at them and form one of those chaotic messes where we all pair up to fight one of them at a time. As you all know, formations are for sissies. Any questions?
Gambo's battle scenes have always been awful, but this scene was especially awful. Worse than the battle of the bastards, which until now has been my benchmark for extremely stupid medieval battle scenes. That's why the best battle scene in the show is the one where Tyrion gets KO'd at the start and they skip to the aftermath.
The bigger failure IMO is the lack of imagination in their entire portrayal of the war with the crab man. The idea here is that it's a war that Daemon thought would be easy and winnable, but then it dragged on for years and never ended - if you really want to sell that concept to the audience, you have to invoke Iraq and Afghanistan. Show us a scene of Daemon and his knights marching around the islands and getting ambushed from the caves. Show us them talking about building trust among the islanders while committing war crimes on them. Go full fucking hog to build this war as one that dragged on, because as it is the war itself just seems to involve a bunch of people camping out on one island until they were almost out of food when they suddenly decided to attack the other island.
Iraq/Afghanistan doesn't even make sense though, the Crab Guy literally rolled in and conquered the islands like months before. he & his were from the other side of the sea trying to expand their influence. something like that dragging on would be because neither side fully committed and left it like some kind of low intensity proxy conflict to occupy Daemon's attention (and like, disrupt and cost money to westeros from the other side ig, their motives are pretty mysterious tbh)
My thought is more about using visual language the audience is familiar with to tell the story of a war not going as planned, not making it a direct parallel.