In 58 BC, Caesar starts his campaigns in Gaul by preventing the Helvetii from completing their migration into Gaul. He also attacks the German forces of Ariovistus and forces them back across the Rhine. His justification for these actions is that each of these intrusions is a threat to the border of the Roman Province. In contrast, what is his justification for the invasion of Britain in 55 BC? Discuss the legality of the invasion of Britain.

In the conquest of the Belgic Coalition, the Nervii tribe takes advantage of the hindrance caused by the baggage being transported by the legions and attacks before the Romans have established their camp. The legions are almost overcome, but after much trouble succeed in almost annihilating the Nervii. Is this vulnerability to attack when they are marching with full baggage and before reinforcing a camp position exploited by any...