The empire famous for its military conquests and strategies during the 4th century BCE is the Macedonian Empire, led by Alexander the Great. Under his leadership, the empire expanded rapidly, conquering vast territories including Greece, Persia, and reaching as far as India. Alexander's innovative military tactics, such as the use of the phalanx and cavalry charges, alongside his ability to inspire and lead troops, played a critical role in these conquests. His campaigns not only established one of the largest empires in history but also spread Greek culture across these regions, laying the groundwork for the Hellenistic Era.