Where did Cleopatra form the army to battle her brother?
The co-ruling dynamic between Cleopatra and her brother Ptolemy XIV was contentious. Shortly after the two ascended to the throne, Ptolemy XIV forced his sister to flee to Syria in 49 BCE. There, she formed an army of mercenaries. The following year, she returned with her army to battle her brother in Pelusium, the easternmost city in Egypt. She won the war, becoming sole ruler of Egypt; Ptolemy XIV was murdered shortly thereafter.
Source: Britannica