[PAR] [TLE] Submarine [SEP] A submarine (or simply sub) is a watercraft capable of independent operation underwater.  It differs from a submersible, which has more limited underwater capability.  The term most commonly refers to a large, crewed vessel.  It is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub.  The noun "submarine" evolved as a shortened form of "submarine boat"; by naval tradition, submarines are usually referred to as "boats" rather than as "ships", regardless of their size ("boat" is usually reserved for seagoing vessels of relatively small size). [PAR] [TLE] QF 6-pounder Hotchkiss [SEP] The Ordnance QF Hotchkiss 6 pounder gun Mk I and Mk II or QF 6 pounder 8 cwt were a family of long-lived light 57 mm naval guns introduced in 1885 to defend against new, small and fast vessels such as torpedo boats and later submarines.  There were many variants produced, often under license which ranged in length from 40 to 58 calibers, but 40 caliber was the most common version.
[PAR] [TLE] Submarine [ SEP ] A submarine ( or simply sub ) is a watercraft capable of independent operation underwater . It differs from a submersible , which has more limited underwater capability . The term most commonly refers to a large , crewed vessel . It is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots , as well as medium - sized or smaller vessels , such as the midget submarine and the wet sub . The noun " submarine " evolved as a shortened form of " submarine boat " ; by naval tradition , submarines are usually referred to as " boats " rather than as " ships " , regardless of their size ( " boat " is usually reserved for seagoing vessels of relatively small size ) . [PAR] [TLE] QF 6-pounder Hotchkiss [ SEP ] The Ordnance QF Hotchkiss 6 pounder gun Mk I and Mk II or QF 6 pounder 8 cwt were a family of long - lived light 57 mm naval guns introduced in 1885 to defend against new , small and fast vessels such as torpedo boats and later submarines . There were many variants produced , often under license which ranged in length from 40 to 58 calibers , but 40 caliber was the most common version .
The Ordnance QF Hotchkiss 6 pounder gun were introduced to defend against watercraft capable of independent operation underwater usually referred to as "boats" rather than what?
The Ordnance QF Hotchkiss 6 pounder gun were introduced to defend against watercraft capable of independent operation underwater usually referred to as " boats " rather than what ?
ships
ships