The Battle of Gaugamela was fought in 331 BC.

The two main commanders in the Battle of Gaugamela were Alexander the Great and Darius III.

Darius' army had the numerical advantage at the Battle of Gaugamela, with an estimated 250,000 soldiers compared to Alexander's 47,000.

The Battle of Gaugamela resulted in a decisive victory for Alexander, effectively ending the Achaemenid Empire and marking the beginning of the Hellenistic period.

The Battle of Gaugamela had several significant consequences, including the end of the Achaemenid Empire, the beginning of the Hellenistic period, and the rise of Alexander the Great.

Alexander's elite cavalry unit that played a crucial role in the Battle of Gaugamela was called The Companions.

Darius' elite cavalry unit that was known for its skill and bravery was called The Immortals.

Alexander's army used the Phalanx formation in the Battle of Gaugamela, which was a dense formation of infantry armed with long spears.

Darius' army used the Wedge Formation in the Battle of Gaugamela, which was a triangular formation designed to break through enemy lines.

Alexander the Great died in Babylon in 323 BC.

Alexander the Great's empire lasted for about 20 years after his death, until it was divided among his generals.

Ptolemy I Soter became the ruler of Egypt after Alexander's death and founded the Ptolemaic dynasty.

Seleucus I Nicator became the ruler of the Seleucid Empire after Alexander's death and founded the Seleucid dynasty.

Cassander became the ruler of Macedon after Alexander's death and founded the Antigonid dynasty.

The Battle of Gaugamela is also known as the Battle of Arbela.