Antony was still fundamentally reliant on Cleopatra for military support. The couple traveled together to Ephesus in 32 BC, where Cleopatra provided him with 200 naval ships of the 800 total he was able to acquire.
The War of Actium was the last civil war of the Roman Republic, fought between Mark Antony (assisted by Cleopatra) and Octavian. In 32 BC, Octavian convinced the Roman Senate to declare war on the Egyptian queen Cleopatra.