A ship commissioned in time of war to exchange the prisoners of any two hostile powers, or to carry a proposal from one to the other; for this reason she has only one gun, for the purpose of firing signals, as the officer who commands her is particularly ordered to carry no cargo, ammunition, or implements of war. Cartel also signifies an agreement between two hostile powers for a mutual exchange of prisoners. In late wars, ships of war fully armed, but under cartel, carried commissions for settling peace, as flags of truce. Cartel-ships, by trading in any way, are liable to confiscation.