Which wartime leader won several successive battles before a crushing defeat in her final battle?

The choice of Boudica is notable because she is a significant figure in British history known for leading a major uprising against the Roman forces in ancient Britain around 60-61 AD. Boudica successfully led her troops in several early victories against the Romans, including the destruction of Camulodunum (modern-day Colchester), the capital of Roman Britain, and the defeat of the forces at Verulamium (St. Albans). Her victories showcased her military leadership and the ability to unite various tribes against a common enemy.

However, her campaign culminated in a tragic defeat at the Battle of Watling Street, where her forces faced a well-trained Roman army led by Governor Suetonius Paulinus. This defeat not only marked the end of Boudica's rebellion but also solidified Roman control over Britain. Thus, her story encapsulates the rise and fall typical of compelling historical narratives, making her the correct answer to the question regarding a wartime leader who experienced several initial victories before a final, decisive defeat. Other figures listed, such as Cleopatra and Elizabeth I, do not fit this specific pattern of wartime leadership characterized by initial success followed by a significant defeat.