He brought 180,000 to 5,000,000 troops and 800 to 4,000 ships across the Hellespont. Sparta and Athens called together a congress to decide who would help defend Greece. 31 Poles agreed to defend Greece against the incoming Persians. Sparta was put in control of the army and the navy. The first war was at Thermopylae. The battle at Thermopylae was positioned at a place called Thermopylae were there was a narrow pass surrounded by cliffs on all sides on one side the cliff ended in the ocean. Leonidas, the leader of the Spartans, knew of a path through the mountains; he sent 1000 men to guard the pass. This battle would be decisive because if the Persians won they could just go down to Athens, destroy the city and then later Greece. The battle of Thermopolay was situated between the mountains and the sea at a place called Thermopylae. There was an opening between the sea and the mountains; the Greeks guarded this passage against the Persians. The Spartan king Leonidas knew of another pass through the mountains. He sent 1000 men to guard the pass. There were 7000 Greek soldiers and 300