In Europe, spears or rather pike formations are a late medieval invention of the late 14th century. Before that people wanted as much cavalry as possible At best, 2/3. If not more.
One of the reasons as to why I decided to write a Naruto Fanfic is because I want to make the world consistent and fix power levels. If you want power, you need to pay a price.
Phalanx - Wikipedia

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