A naval force, under the com-mand of an officer appointed by government, for the protection of merchant-ships and oth-ers, during the whole voyage, or such part of it as is known to require such protection. Marsh. Ins. b. 1, c. 9, S 5; Park, Ins. 388; Peake, Add. Cas. 143n; 2 H. Bl. 551
