“Finding that I was no match for him in the warrior’s art, I resorted to others and glided away in the form of a serpent. I curled my body in a coil and hissed at him with my forked tongue. He smiled scornfully at this, and said, ’It was the labor of my infancy to conquer snakes.’ So saying he clasped my neck with his hands. I was almost choked, and struggled to get my neck out of his grasp. Vanquished in this form, I tried what alone remained to me and assumed the form of a bull. He grasped my neck with his arm, and dragging my head down to the ground, overthrew me on the sand. Nor was this enough. His ruthless hand rent my horn from my head. The Naiades took it, consecrated it, and filled it with fragrant flowers. Plenty adopted my horn and made it her own, and called it ‘Cornucopia.’”
The ancients were fond of finding a hidden meaning in their mythological tales. They explain this fight of Achelous with Hercules by saying Achelous was a river that in seasons of rain overflowed its banks. When the fable says that Achelous loved Dejanira, and sought a union with her, the meaning is that the river in its windings flowed through part of Dejanira’s kingdom. It was said to take the form of a snake because of its winding, and of a bull because it made a brawling or roaring in its course. When the river swelled, it made itself another channel. Thus its head was horned. Hercules prevented the return of these periodical overflows by embankments and canals; and therefore he was said to have vanquished the river-god and cut off his horn. Finally, the lands formerly subject to overflow, but now redeemed, became very fertile, and this is meant by the horn of plenty.