By what routes did the Persians choose to attack Greece?

1. The Persians had three main routes to choose from when they decided to attack Greece.

2. The first was the Hellespont, a narrow strait of water that separates Europe and Asia. The Persians could cross the Hellespont by building a bridge or by using ships.

3. The second was the Bosporus, another narrow strait of water that connects the Black Sea and the Aegean Sea. The Persians could cross the Bosporus in the same way they could cross the Hellespont.

4. The third was the Danube River. The Persians could follow the Danube River into Greece, but this route was more difficult and time-consuming.

5. The Persians chose to cross the Hellespont on a bridge of boats, which was constructed by engineers of Miletus.

6. They also had a fleet of ships that transported supplies and provided support.