Celtic warfare
The "Gallic Wars" were a series of military campaigns waged by the Roman proconsul Julius Caesar against Gallic tribes, lasting from 58 BC to 51 BC. The Romans would also raid Britannia and Germania, but these expeditions never developed into full-scale invasions. The Gallic Wars culminated in the decisive Battle of Alesia in 52 BC, in which a complete Roman victory resulted in the expansion of the Roman Republic over the whole of Gaul. The wars paved the way for Caesar to become the sole ruler of the Roman Republic.
Battle of Sena Gallica (551)
The Battle of Sena Gallica, was a naval battle fought off the Italian Adriatic coast in the autumn of 551 between an East Roman (Byzantine) and an Ostrogoth fleet, during the Gothic War (535–554). It marked the end of the Goths' brief bid to deny the seas to the Romans, and the beginning of the Byzantine resurgence in the war under the leadership of Narses.