Megasthenes was an ancient Greek historian and diplomat who wrote extensively on the Indian subcontinent. In his work "Indica," he mentions a committee with six subcommittees of military, of which the fifth looked after chariots.

Explanation:

1. Committee with six subcommittees of military:
Megasthenes mentions a committee which was responsible for the military affairs of the Mauryan Empire. This committee had six subcommittees that looked after different aspects of the military.

2. Fifth subcommittee:
Out of the six subcommittees, the fifth subcommittee was responsible for the chariots.

3. Importance of chariots in ancient warfare:
In ancient warfare, chariots were an important mode of transportation and played a crucial role in battles. They were used to carry soldiers and weapons into battle and were also used for reconnaissance and as a mobile command center.

4. Use of chariots in the Mauryan Empire:
The Mauryan Empire was known for its strong military and the use of chariots was an important part of their warfare strategy. The chariots were often pulled by horses and were used in combination with elephants and foot soldiers.

5. Other subcommittees:
The other subcommittees of the military committee were responsible for different aspects of the military. The first subcommittee looked after the infantry, the second subcommittee looked after the cavalry, the third subcommittee looked after the elephants, the fourth subcommittee looked after the chariots, and the sixth subcommittee looked after the logistics and supply chain management of the military.

Conclusion:
Megasthenes' mention of the committee with six subcommittees of military, including the fifth subcommittee responsible for chariots, highlights the importance of chariots in ancient warfare and the Mauryan Empire's strong military strategy.