- - W.W. II shipping worries
- - W.W. II threats
- - WWII fleet
- - Commerce-raiding fleet
- - World War II vessels
- - W.W. II wolf pack
- - WW II fleet
- - Maritime hazard in W. W. II
- - Prowlers of W.W. II
- - W.W. II craft
- - a sub to replace german ones
- - dumb loyalty's regularly seen in ww2 sea battles
- - Underwater craft about to move south
- - Subs turning to a sub
- - Vessels hunted by K-ships
- - German submarines of WW11
- - Submersible ships of WW2
- - Snake taken initially on board American vessels
- - WWII subs
- - WWII threats
- - German subs
- - WWII wolfpack members
- - Old war subs
- - They scared Churchill, by his own admission
- - They hid beneath the surface
- - World War menaces
- - 1940s blockade enforcers
- - German submarines of WW2
- - Those who rarely put their head above water were part of major conflict in the sink business
- - Wolfpack vessels
- - German destroyers of US ships
- - Wolf pack members
- - WWII ship sinkers
- - The only things that "really frightened" Churchill during WWII
- - Some subs
- - Submerged threats of WWII
- - Ashcan targets
- - Old minelayers
- - WWII wolf pack vessels
- - Destroyer destroyers
- - Maritime hazards in WWII
- - German military subs
- - WWII depth charge targets
- - Wolf pack makeup
- - WWII "wolf pack"
- - WWII maritime hazard
- - Maritime hazard in WWII
- - Threats to World War shipping
- - Battle of the Atlantic attackers
- - Some WWII crafts
- - Submerged threats of WW2
- - World War marine menaces
- - Enemy submarines, once
- - WWI menaces
- - Wolf pack units
- - German submarines
- - Underwater "wolf pack"
- - Corvettes' targets
- - Sea raiders
- - Wartime menaces
- - German craft
- - Menace of 1917.
- - Certain craft.
- - Undersea craft.
- - Germany's challenge in World War I.
- - German pig boats.
- - Commanded by Tirpitz in 1915.
- - Vessels that drop mines
- - Depth charge targets
- - Battle of the Atlantic craft
- - WWII vessels
- - WWII craft
- - one of them sank hms royal oak in scapa flow
- - abs out to sink german subs
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- [ Other definitions ]