WI Caesar loses battle of Munda in 45 BC?

In 17 March 45 BC Julius Caesar's 8 Legions clashed with Pompey's 13 Legions near Munda in Southern Hispania... The fighting lasted for some time without a clear advantage for either side, causing the generals to leave their commanding positions and join the ranks. As Caesar himself later said he had fought many times for victory, but at Munda he had to fight for his life. Caesar took command of his right wing, where his favorite X Equestris was involved in heavy fighting. With Caesar’s inspiration the tenth legion began to push back Pompeius' forces. Aware of the danger, Gnaeus Pompeius removed a legion from his own right wing to reinforce the threatened left wing. However, as soon as the Pompeian right wing was thus weakened, Caesar's cavalry launched a decisive attack which turned the course of the battle. King Bogud of Mauretania and his cavalry, Caesar's allies, attacked the rear of the Pompeian camp. Titus Labienus, commander of the Pompeian cavalry, saw this maneuver and moved to intercept them. Unfortunately for Pompeius, his legionaries misinterpreted the situation. Already under heavy pressure on both the left (from Legio X) and right wings (the cavalry charge), they thought Labienus was retreating. The Pompeian legions broke their lines and fled in disorder. Although some were able to find refuge within the walls of Munda, many more were killed in the rout. At the end of the battle there were about 30,000 Pompeians dead on the field; losses on Caesar’s side were much lighter, only about 1,000. All thirteen standards of the Pompeian legions were captured, a sign of complete disbandment. Titus Labienus died on the field and was granted a burial by Caesar, while Gnaeus and Sextus Pompeius managed to escape from the battlefield.
WI Optimate forces didnt misinterpret Labienus move and eventually won the battle? How is a potential Caesar's defeat in Munda alters History? Any thoughts?
 
No. There was a Mauretania in antiquity, along the North African coast (Northern Morocco and Algeria).

Wasn't it more or less like Numidia, just with more black Africans?

As for your POD, I think it might be a little late in the war to alter things dramatically for the Populares. I could be mistaken, since my knowledge of the period is hazy, but unless Caesar is killed in action, the Optimates have it sealed.
If I recall correctly, Munda took place in Hispania, so you could maybe make the argument where the Optimates reunite the rest of the empire but Iberia remains a considerable threat to the Optimates? Has Numidia already been neutralized in the war? I believe they were allied to the Populares as well.
 
Could a potential Caesar's defeat in Hispania make this province and other western provinces a breakaway part of Roman Republic under Pompey's sons?
 
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