Commentaries on the Gallic War · Chapter
Book IV: The Rhine Crossing and First Invasion of Britain explained
Caesar negotiates with the Usipetes and Tenchtheri, defeats them in battle, and then builds a bridge across the Rhine to intimidate the German tribes.
What happens
Caesar negotiates with the Usipetes and Tenchtheri, defeats them in battle, and then builds a bridge across the Rhine to intimidate the German tribes. He also prepares for and executes his first invasion of Britain, facing resistance from the Britons and overcoming difficult landing conditions.
Themes in this chapter
Military Conquest and Imperialism
Caesar's campaigns against the German tribes and his invasion of Britain exemplify Roman expansionism.
Warfare and Strategy
Detailed descriptions of cavalry skirmishes, bridge construction, and amphibious landing tactics highlight military strategy.
Civilization vs. Barbarism
Caesar contrasts Roman discipline and engineering with the 'savage and barbarous' nations of Germany and Britain.
Characters to notice
- Julius Caesar
Commands the Roman army, negotiates with German tribes, builds the Rhine bridge, and leads the first invasion of Britain.
- Commius
Sent by Caesar to Britain to persuade states to submit to Rome before the invasion.
- Caius Volusenus
Sent ahead to reconnoiter the British coast and reports back to Caesar.
- Quintus Titurius Sabinus
Left in command of part of the army to campaign against the Menapii and Morini.
- Lucius Aurunculeius Cotta
Left with Sabinus to lead troops against the Menapii and Morini.
- Marcus Piso
An Aquitanian nobleman and valiant cavalryman killed in the skirmish with the Usipetes and Tenchtheri.
Key passages
“That he could make no alliance with them, if they continued in Gaul; that it was not probable that they who were not able to defend their own territories, should get possession of those of others, nor were there any lands lying waste in Gaul which could be given away, especially to so great a number of men, without doing wrong to others; but they might, if they were desirous, settle in the territories of the Ubii.”
Caesar refused to let the German tribes settle in Gaul, arguing they could not defend their own lands and there was no vacant territory; instead, he offered them the chance to settle among the Ubii.
Caesar's diplomatic stance on the German migration.
“He devised this plan of a bridge. He joined together at the distance of two feet, two piles, each a foot and a half thick, sharpened a little at the lower end, and proportioned in length to the depth of the river.”
Caesar designed a bridge by driving paired piles into the riverbed, angled against the current, and bracing them with crossbeams to withstand the flow.
Description of Caesar's innovative bridge construction across the Rhine.
“The nature of the place was this: the sea was confined by mountains so close to it that a dart could be thrown from their summit upon the shore. Considering this by no means a fit place for disembarking, he remained at anchor till the ninth hour, for the other ships to arrive there.”
The British coast was so steep that missiles could be thrown from the cliffs onto the shore, so Caesar waited for the rest of his fleet before finding a better landing site.
Caesar's cautious approach to landing in Britain.