uboats
- Wolfpack vessels
- Wolf pack members
- Wartime menaces
- Some WWII crafts
- WWII wolfpack members
- WWII threats
- WWII ship sinkers
- WWII maritime hazard
- WWII depth charge targets
- WWII "wolf pack"
- World War menaces
- Wolf pack units
- W.W. II shipping worries
- Vessels that drop mines
- They scared Churchill, by his own admission
- They hid beneath the surface
- Prowlers of W.W. II
- Maritime hazards in WWII
- Maritime hazard in WWII
- German military subs
- German destroyers of US ships
- Commerce-raiding fleet
- Battle of the Atlantic attackers
- Ashcan targets
- W.W. II craft
- Maritime hazard in W. W. II
- Depth charge targets
- German subs
- World War marine menaces
- W.W. II wolf pack
- Threats to World War shipping
- W.W. II threats
- Old minelayers
- World War II vessels
- Corvettes' targets
- Underwater "wolf pack"
- Sea raiders
- German submarines
- Which one of these was cycling round grass and water hazard?
- WWII craft
- WWII vessels
- WWII subs
- WWII fleet
- Some subs
- Submerged threats of WWII
- German craft
- Battle of the Atlantic craft
- Wolf pack makeup