Explanation:

Towards the middle of the fifth century A.D. the reign of the Kumaragupta-I was disturbed by the revolt of Pushyamitra tribe and the invasion of the Hunas. But his greatest achievement was his repulsing the attack of the Pushyamitra. Hunas were also defeated by the crown prince Skandagupta.
Kumaragupta-I was a successful ruler who kept intact the vast empire inherited from his father and also maintained peace and prosperity within its frontiers. The suppression of Pushyamitras rebellion and the defeat of Hunas by his crown prince proves that the military strength of the empire also remained intact under him.