Soon after Alexander's return into Macedon, he learned that there were symptoms of revolt among these nations. Philip had subdued them, and established the kind of peace which the Greeks and Romans were accustomed to enforce upon their neighbors. But now, as they had heard that Philip, who had been so terrible a warrior, was no more, and that his son, scarcely out of his teens, had succeeded to the throne, they thought a suitable occasion had arrived to try their strength. Alexander made immediate arrangements for moving northward with his army to settle this question.