Fabius Maximus (2.2-2.3)

But Hannibal now burst into Italy,[*] and was at first victorious in battle at the river Trebia. Then he marched through Tuscany, ravaging the country, and smote Rome with dire consternation and fear. Signs and portents occurred, some familiar to the Romans, like peals of thunder, others wholly strange and quite extraordinary.

For instance, it was said that shields sweated blood, that ears of corn were cut at Antium with blood upon them, that blazing, fiery stones fell from on high, and that the people of Falerii saw the heavens open and many tablets fall down and scatter themselves abroad, and that on one of these was written in letters plain to see, Mars now brandisheth his weapons. [*]