Which battle did Caesar win to end the Gallic War and assert his dominance over Gaul?

• A. Battle of Pharsalus
• B. The Siege of Alesia, where Caesar defeated Vercingetorix.
• C. Battle of Zama
• D. Battle of Actium

Answer: (D)

The decisive moment is the siege of Alesia, where Caesar forced the surrender of Vercingetorix and completed Roman domination over Gaul. In 52 BCE, Caesar’s legions surrounded Alesia, constructing a ring of earthworks and fortifications to trap the Gauls inside while also facing a large external Gallic relief army. The double enclosure — Roman lines around the town and additional fortifications to block relief forces — pressed the Gauls from both inside and outside, and after stubborn fighting Vercingetorix surrendered. This victory eradicated major Gallic resistance and made Caesar the uncontested master of Gaul, boosting his political power in Rome and paving the way for his subsequent rise.

The other battles belong to different conflicts. The battle at Pharsalus was fought during Caesar’s civil war against Pompey and does not end the Gallic campaigns. The battle at Zama occurred in the Second Punic War long before Caesar’s time, and Actium is the later naval clash between Octavian and Antony that ended the civil wars, not related to Gaul.