When did matthew flinders go to jail?

In 1803 Flinders was returning to England with the work of his discoveries in Australia, but his ship was leaking badly and he needed emergency repairs.

He put into the French-controlled island of Mauritius, in the Indian ocean in late December 1803. He did not know that England and France were at war.

Within a few days the French governor Decaen concluded that Flinders was a "spy", and Flinders was imprisoned on the island.

He remained a prisoner of the French until June 1810, when British ships blockaded the island and forced his release.