During the period of the Napoleonic Wars, the East India Company arranged for letters of marque for its vessels such as the Lord Nelson. This was not so that they could carry cannon to fend off warships, privateers and pirates on their voyages to India and China (that they could do without permission) but so that, should they have the opportunity to take a prize, they could do so without being guilty of piracy. Similarly, the Earl of Mornington, an East India Company packet ship of only six guns, also sailed under a letter of marque.
During what war Did the EIC get letter of marque for its vessels
Napoleonic Wars