And you could imagine that this is a very strategic location. Anyone who wants to conquer the Peloponnese by land is going to have to go through there. But the Athenians are, of course, no, we care about protecting ourselves. And so they start to build this wall to protect themselves, which the Spartans already are not so happy about. Now the other thing that the Athenians do, they continue to build up their naval power. They see, hey, this is a very useful thing. They start connecting with a bunch of allies around the Aegean, some on islands, some on the coast of Anatolia over here.