The plagues that the Holy One brought upon the Egyptians were the means of establishing peace for them. How so? There had been a dispute between the Ethiopians and the Egyptians, the Egyptians claiming, “Our borders extend to here,” and the Ethiopians claiming, “No, our borders extend to here.” But when the frogs came, they made peace between them, for the frogs entered only the Egyptian territory and thus the fieldsThanks frogs!
that did not belong to the Ethiopians were clearly identified (Exod. Rab. 10:2)
For more exciting stories from the ancient rabbis be sure to check out Joel S. Allen's forthcoming book entitled Jewish Biblical Legends. It's great fun!