They have reached to the today's Scotland and then built the Hadrians wall so the north empire can not attack them.
The Helvetii , Suebi , Veneti , Britons and Catuvellauni .
There were some minor incursions before 410AD but they did not really have too because the Roman legions left before they arrived. It was in fact the power vacuum left by the Romans which the Anglo-Saxons filled. They fought against the native Britons.
The Romans fight against the Macedonians in the sea battle.
975 ad
It was Carthage.
Each other, Irish, Picts, Romans, Germans.
Romans got lazy and hired non-patriotic Germanians to fight for them.
Yes. In the Samnite Wars. The Romans, even though they had an alliance with the Samnites, were moved by Campania's surrender to them and decided they would fight for Campania, against the invading Samnites.
Pontiac's War (or Pontiac's Rebellion) occurred when the Indians decided to fight against the settlers.
Boudicca lost her revolt against the Romans because she did not have the troops or the organization that the Romans had. She rallied her tribesmen to fight against the Roman army bu they were greatly outnumbered in men, weapons and strategy.
Pontiac 's Rebellion
The Romans fought for fun and for their entertainment.