[2] Papal brief dated 14 June 1785 made him the Coadjutor Superior of Karnatic Mission with Doliche as his titular see.

One of his first acts was to prevent Karaikal in Malabar mission to be entrusted to the Apostolic Prefecture run by the Capuchins.

Benjamin and Bishop Champagne agreed to iron out the then existing jurisdictional difficulties by mutually transmitting their powers.

Customs of India sometimes raising doubts that left no worry of some missionaries, the bishop gave them advice marked mindedness and based on experience.

In 1792 Mgr.Champenois was forced by the British soldiers to sing Te Deum in the Place d'Armes, where they had to plant a tree of liberty, but he refused.

In order to end this situation, he tried unsuccessfully to get the title of Vicar Apostolic: the Holy See maintained the status quo.

Champenois necessary passport to visit the two missions that Rome entrusted to him by the brief of 23 August 1796: one with the Capuchins of Patna, the other among the missionaries of Madras in order to bring harmony among these apostolic workers, and to put an end to the administrative difficulties.

His official biography at MEP archives end as follows: "His administration was wise, prudent, and with very limited resources, he managed to deal with the most pressing needs".