It's cool to see you updating this, Baron Lopi. Have you done any research into the battle since releasing the original version of the cinematic? Here are a few tidbits:
Darius wasn't at the battle.
The Persian army was commanded by an aristocrat named Datis.
The Persians had along with them a previous tyrant of Athens named Hippias, to use him as governor if they were to capture the city.
Miltiades wasn't the actual leader of the Greek army. There were 11 generals, among them Gallimachus (the polemarch, or "lead" general), Themistocles, and Aristodes.
The generals had to vote on any course of action. Miltiades wanted to attack and got 4 others (including Themistocles and Aristides) on his side. 5 others opposed. Gallimachus cast the tie breaker to attack the Persians.
The Athenian generals feared that if they didn't defeat the Persians soon, anti-democratic aristocrats in Athens would try to take over the city in a coup.
1,000 hoplites from the town of Plataea arrived to help their Athenian friends days before the battle, bringing the Greek forces up to around 10-11,000.
The Persian cavalry made no significant contribution to the battle.
The Greeks used the novel tactic of thinning the center of their lines and strengthening their wings, thus when the Persians pushed through the center, the Greeks would defeat the Persian wings and wheel inward upon the Persians, effectively surrounding them. This is the first instance of a "double envelopment" in history.
The former tyrant Hippias died in the battle.
6,400 Persians were killed, but the rest, around 14,000 escaped to their ships.
The Persians sailed around the coast of Attica to the shores of the Athenian harbor of Phaeleron in hopes of surprise attacking the city, only to find the Greek army had marched all night and garrisoned the city before the Persians arrived. The Persians sailed away disheartened.
Before the battle, the Athenians sent a runner to Sparta to ask for help, but the Spartans didn't begin the march until after thier holiday to honor Apollo had ended. They arrived a day too late.