The naval battle off Tauris Island in the Adriatic Sea was fought between Caesarean and Pompeiian forces after the Great Roman Civil War. The opposing fleets clashed at such close quarters that melee combat essentially decided the battle.
Conquering a land is not as simple as winning battles. Julius Caesar had to park his troops in various hostile neighborhoods and deal with repeated uprisings until the natives there could be beaten into submission and resolve to accept Roman yoke because resisting it would be too fatal.
Much like Mongol attempts to invade Japan, Romans faced the challenge of safely transporting their army to a rocky island across a stormy sea.
During Julius Caesar’s tenure as war-lording proconsul of Gaul, a consistent feature of the Gallic landscape was the barbarous presence of invading semi-nomadic Germans who liked to raid, plunder, and fight.