Games and movies use bad formations.
“It is thus worth noting even here – we’ll see it even more clearly in a moment – that the most dense formation was not, in actual battle conditions, generally the best, because soldiers even using pikes (much less swords or spears) need space to move both themselves and their weapons in order to fight effectively. This is one of those cases where the video-game logic (pack as many men as close together so they can all deal their 1d10 piercing damage) doesn’t actually work on real battlefields where the physics are every bit as complex as real physics.”