How was Samudragupta a bold and great conquerer?

Samudragupta was a bold and great conquerer as he defeated all the rulers of his time and extended his empire from Brahmaputra in east to rivers Yamuna and Chambal in the west and from Himalayas in the north to Narmada in south. It is because of his bravery and generalship that he is known as 'Napoleon of India'. During his famous Deccan campaign he covered more than 3000 miles through dense forests. Though he defeated many powerful rulers, he did not annex southern territories. He made the southern kings accept his authority and allowed them to rule.