But if we leave these men too in the lurch, Athenians, and then Olynthus is crushed by Philip, tell me what is to prevent him from marching henceforward just where he pleases. I wonder if any one of you in this audience watches and notes the steps by which Philip, weak at first, has grown so powerful. First he seized Amphipolis , next Pydna , then Potidaea , after that Methone , lastly he invaded Thessaly .