To Proletariat
It is indeed true that when you put two equal strenght phalanx units againts each other and stretch one out, it will win, because it will wrap around the other phalanx and flank it. But the people here were talking about a cavalry charge, which changes the situation. If you put a stretched two line phalanx up against a cavalry charge, it will do worse than a compact phalanx. Because the cavalry will brake through it's lines and will have the center spearmen surrounded and fighting with swords, while the men on the flanks of the phalanx will not even see the fight as they are so far away. This will lead to cavalry picking phalanx men one by one and not even facing spears after the initial clash.
Thus it obvious that the number of lines and the depth of the formation both matter when facing different enemies, the unit stats won't change, but it will fight with different effeciancy based on its formation and the enemy.
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