Hercules and the Stymphalian Birds

Hercules made the great river Alpheus change his course, and came foaming and roaring through the filthy stables. In less than a day, all the dirt was cleared and rolled away to the sea. Hercules then asked for his reward. The king of Agius claiming that he had performed the task not with his own hands, but by a tray, refused to give it to him. He even banished his own son, who took the side of Hercules and approached his father for not keeping his promise. With his rich reward, he returned to Mycenae, ready to undertake whatever new task was given him by Eurystheus.