Explanation:

• The Policy of Ring-Fence Warren Hastings took charge as the governor-general at a critical period of British rule when the British were to encounter the powerful combination of the Marathas,Mysore, and Hyderabad. He followed a policy of ring-fence which aimed at creating buffer zones to defend the Company’s frontiers.
• Broadly speaking, it was the policy of defence of their neighbours’ frontiers for safeguarding their own territories.This policy of Warren Hastings was reflected in his war against the Marathas and Mysore.