By skyforbes Movies are meant to be cinematic and look cool, so when it comes to battles, the rule of cool usually prevails over sound military strategies. Realistic portrayals of battles can be interesting when done well, but most directors prefer to go for spectacle.
The most notable example of this would be 300. They occasionally pay lip service to the importance of military formations, but in practice the Spartans just go out and fight on their own like badasses who each can take on dozens of Persians all on their own.
The Lord of the Rings movies also often rely on rule of cool for their battle scenes, especially with anything involving Legolas.
It is also quite common in superhero movies. Avengers: Infinity War and Endgame both end with large armies just charging towards each other and fighting in melee combat, with minimal use of vehicles or long-ranged weaponry.
So what other movies employ pretty dubious tactics but audiences don't care because it just looks so cool?