In his last victory, Julius Caesar defeats the Pompeian forces of Titus Labienus and Pompey the Younger in the Battle of Munda.

Caesar's best general had turned against him, and at the Battle of Munda on March 17, 45 BC, that betrayal nearly succeeded. Titus Labienus, who had served as Caesar's most trusted lieutenant during the eight-year conquest of Gaul, commanded the Pompeian forces alongside Pompey the Younger in what became the bloodiest and most desperate battle of the entire Roman civil war. Labienus knew Caesar's tactics intimately because he had helped develop them. For eight years in Gaul, he had led independent commands, won major battles, and earned a reputation as one of the most capable Roman generals of his generation. When the civil war broke out in 49 BC, Labienus chose the Senate's side and joined Pompey the Great, stunning Caesar and depriving him of his most experienced subordinate. The battle at Munda, in southern Spain, was fought between roughly equal forces. Caesar commanded approximately 40,000 legionaries against a Pompeian army of similar size that held the high ground. The fighting was prolonged and savage, with neither side gaining a decisive advantage for hours. Caesar later admitted that at Munda he fought not for victory but for his life. At one critical moment, when his right wing began to buckle, Caesar reportedly grabbed a shield and rushed to the front line, rallying his troops through personal example. The turning point came when Caesar's cavalry found a gap in the Pompeian left flank. Labienus shifted troops to counter the threat, and the Pompeian soldiers on the right interpreted the movement as a retreat, causing a cascading collapse. The rout was total. Ancient sources claim 30,000 Pompeian soldiers died, though the number is likely exaggerated. Labienus fell in the battle. Pompey the Younger was captured and executed days later. His brother Sextus Pompey escaped and continued guerrilla resistance at sea for years. Munda was Caesar's last battlefield victory. Eleven months later, he lay dead on the Senate floor, murdered by men who feared what he had proved at Munda: that no one in the Roman world could stop him.