The English fleet in its turn suffered from a hurricane, and the siege was raised in October.
Shortly after came the news of the Peace of Aix-la-Chapelle, which ended the European war.

Dupleix, with his home communications restored, could now resume his subtle and persevering efforts to secure a territorial base which should, as far as possible, shelter him from the chances of sea war.

Pity that so much genius and patience should have been spent in an effort wholly vain; nothing could protect against that sea attack but a naval aid, which the home government could not give.

One of the conditions of the peace was that Madras should be restored to the English in exchange for Louisburg, the prize won by the North American colonists and released by them as reluctantly as Madras was by Dupleix.

This was indeed illustrating Napoleon's boast that he would reconquer Pondicherry on the bank of the Vistula; yet, although the maritime supremacy of England made Louisburg in her hands much stronger than Madras, or any other position in India, when held by the French, the gain by the exchange was decidedly on the side of Great Britain.