How did sparta turn the tide in its war against athens?
o by allowing women to serve in the army
o by forming an alliance with egypt
o by defending the narrow pass at thermopylae
o by forming an alliance with persia

By forming an alliance with Persia.

Explanation:

Although in the previous war Sparta and Persia were enemies, when the between Athens and Sparta started in 431 BC Persia wanted to use the situation to spread its influence in the Greek world.

The Persian helped Sparta with money and ships, which eventually led to their victory in the war.

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