Perinthus

…Greek allies, the cities of Perinthus (later called Heraclea, present-day Marmaraereğlisi) and Byzantium, to review their position, and his coercion of them led to the two great sieges that showed the development of his artillery and allied arms, of which his son Alexander was to make greater use in Asia.

…attacked the Greek city of Perinthus in 340. Perinthus was helped by Byzantium and other Greek communities, including Athens, and even by the Persian satraps (which represents the first collision between the two great powers, Macedon and Persia). Despite all Philip’s efforts (and artillery), Perinthus held out. In 340 an…