Battle of Pharsalus
But Labienus's ill fortune under Pompey was as marked as his success had been under Caesar. From the defeat at the Battle of Pharsalus, where he commanded the cavalry, he fled to Corcyra, and after hearing of the death of Pompey then proceeded to Africa. He created confidence in the followers of Pompey by lying to them, claiming that Caesar had received a mortal wound at the Battle of Pharsalus. He was able through sheer force of numbers to inflict a slight check upon Caesar at the Battle of Ruspina in 46 BC. By arranging his troops into dense formations, he tricked Caesar into thinking he had only foot soldiers, and was able to rout Caesar's cavalry and surround his army. However, Labienus was unable to defeat Caesar's forces, and was compelled to leave the field. After the defeat at the Battle of Thapsus, he joined the younger Gnaeus Pompeius in Hispania.