[149]           Man of War in this context is not the painfully aggressive jellyfish. Mary uses ‘Man of War’ here to describe a powerful warship or frigate.

Physalia physalis should be avoided in the Atlantic Ocean, as well as in the Indian and Pacific Oceans. Its sting is known to be very painful and even fatal.
Artist: from Alamy

Have you ever encountered a Man of War, either in the sea, or on land?

Gulliver being recruted to the Lilliputian army, getting ready to give his life for the glory of the Emperor.
Artist: Unknown