That's where you also had the naval route of the Persian navy. And so the Athenians decide, hey, let's move back to Athens. And in deciding to move back to Athens, right over there, they say, okay, well, we want to build a wall around Athens in case anyone else wants to invade us. And you might say, okay, maybe they're somewhat concerned about the Persians, but you could also argue that they're somewhat concerned about the Spartans, who are famous for having this very powerful army. And so they start the construction on what's often called the Long Wall, and it's a way for them to have access to the sea and to protect their city in the event of a siege. Now, if you take the other side, if you think about what's going on in the minds of the Spartans, they are thinking, okay, you know, for a long time, we were really the dominant military power. But what we've just seen with the Greco-Persian Wars is this Athenian navy is actually quite strong.