On the second panel there should be some op & plot-armoured heroes that have a neat line of enemies formed in front of them attacking one at a time & the rest just patiently waiting for their turn as to not overwhelm the main char.

The movie 300 is one of the worst perpetrators of this. Though I guess tbf it's argued that the movie is just the storytelling of the Spartan who Leonidas told to return to Sparta

Everybody gangsta till they hit a phalanx

You can kind of see what ancient battles probably looked like by checking out the skirmishes on the Indian Chinese border where they aren't allowed guns.

I'd be such a bitch in an ancient battle. Yeah, I love the idea of roaring and swinging a weapon around whilst hulking in armor (except you know I'd be the guy who got a quilted gambeson at best), but I am so afraid of being sliced or pulverized. Imagine being in a simple knife fight. That's terrifying enough. And let's say you survive the first fight without getting your arm cleaved off or the head of an axe buried snug into your ribcage. Now what? Count your blessings and move on to the next guy within swinging range? Roll the dice on that desperate monster with a frantic look in his eye and hope you don't catch a glaive in the meantime? And say you beat him and the others? You survive the battle with manageable wounds and have to worry about the next one? Fuck that, dude. I'd be desserting on day one to live as a hermit in the woods. King can eat me arse. I'd rather live with the crones of Crookback Bog.

That’s a huge battle all the way from the west coast of Africa to the east coast of South America!

I think it's funny how so many ancient battles involve the winning side's center giving way (whether intentionally or not), and the losing side's center over-pursuing their ostensibly routed foe and then getting slaughtered from the flanks. Cannae, Gaugamela, Hastings and a bunch of others all fit this pattern. Hell, even WWI (in the West at least) was basically this shit for most of its four years. Even Stalingrad and the Battle of the Bulge were exactly this in WWII.

Looks like a factorio map view of your defense's vs bugs attacking