![TIL That WWI German U-boats were so difficult to combat that British sailors were ordered to try and break the periscope with a hammer to stop them. : r/todayilearned TIL That WWI German U-boats were so difficult to combat that British sailors were ordered to try and break the periscope with a hammer to stop them. : r/todayilearned](https://external-preview.redd.it/w8vNYmugdy7kf2a7l8snWE8OkzmoaYc8mX4m9CgH0JM.jpg?width=640&crop=smart&auto=webp&s=be137acbcd87501524bb512386d98c65f81e8e08)
TIL That WWI German U-boats were so difficult to combat that British sailors were ordered to try and break the periscope with a hammer to stop them. : r/todayilearned
![A German Sailor Operating a U-Boat Periscope, Stock Photo, Picture And Rights Managed Image. Pic. MEV-13150659 | agefotostock A German Sailor Operating a U-Boat Periscope, Stock Photo, Picture And Rights Managed Image. Pic. MEV-13150659 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/69b3d95c0f0f76e46e618d72f4e3683e/mev-13150659.jpg)
A German Sailor Operating a U-Boat Periscope, Stock Photo, Picture And Rights Managed Image. Pic. MEV-13150659 | agefotostock
![Mint Germany Real Picture Postcard U Boat Submarine commander at the periscope | Topics - Militaria - Other, Postcard / HipPostcard Mint Germany Real Picture Postcard U Boat Submarine commander at the periscope | Topics - Militaria - Other, Postcard / HipPostcard](https://storage.googleapis.com/hippostcard/p/f00735113bc94bf4da70695054fba6f7-800.jpg)
Mint Germany Real Picture Postcard U Boat Submarine commander at the periscope | Topics - Militaria - Other, Postcard / HipPostcard
![Atlantic Ocean Circa 19421944 World War Stock Footage Video (100% Royalty-free) 1973110 | Shutterstock Atlantic Ocean Circa 19421944 World War Stock Footage Video (100% Royalty-free) 1973110 | Shutterstock](https://ak0.picdn.net/shutterstock/videos/1973110/thumb/1.jpg?ip=x480)
Atlantic Ocean Circa 19421944 World War Stock Footage Video (100% Royalty-free) 1973110 | Shutterstock
![Amazon.com: WWI German Submarine Ncaptured German Mine-Laying U-Boat Sm Uc-5 Showing The Conning Tower Periscope and Mines Photographed During World War I C1916 Poster Print by (24 x 36): Posters & Prints Amazon.com: WWI German Submarine Ncaptured German Mine-Laying U-Boat Sm Uc-5 Showing The Conning Tower Periscope and Mines Photographed During World War I C1916 Poster Print by (24 x 36): Posters & Prints](https://m.media-amazon.com/images/I/71Zl86eJSwL._AC_UF894,1000_QL80_.jpg)
Amazon.com: WWI German Submarine Ncaptured German Mine-Laying U-Boat Sm Uc-5 Showing The Conning Tower Periscope and Mines Photographed During World War I C1916 Poster Print by (24 x 36): Posters & Prints
![U-BOOT COMMANDER ON PERISCOPE TAKES AIM on this RARE ORIGINAL WW2 NAZI STAMP! MINT CONDITION! : Toys & Games - Amazon.com U-BOOT COMMANDER ON PERISCOPE TAKES AIM on this RARE ORIGINAL WW2 NAZI STAMP! MINT CONDITION! : Toys & Games - Amazon.com](https://m.media-amazon.com/images/I/71d6a6xfm1L._AC_UF894,1000_QL80_.jpg)