Battle of the Lake Trasimeno.

A photo from Umbria: happy Sunday.

The Battle of Lake Trasimeno was fought when a Carthaginian force under Hannibal ambushed a Roman army commanded by Gaius Flaminius on 21 June 217 BC, during the Second Punic War. The battle took place on the north shore of Lake Trasimeno, to the south of Cortona, and resulted in a heavy defeat for the Romans.
A Carthaginian army more than 50,000 strong crossed the range by a difficult but unguarded route. The Carthaginians moved south into Etruria, plundering, razing the villages and killing all adult males encountered. Flaminius, in charge of the nearest Roman army, set off in pursuit. Hannibal arranged an ambush on the north shore of Lake Trasimeno and trapped the Romans.
With the Carthaginians attacking unexpectedly from the flank and the rear, there was no chance for the Romans to form even a rudimentary fighting line and they were defeated after three hours hard fighting. All 25,000 Romans in Flaminius's army were killed or captured.