| Answer | Crossword Clue |
|---|---|
| YSER | Embattled river of WWI |
| YSER | Strategic Belgian river of WWI |
| YSER | River that was the scene of WWI fighting |
| MARNE | WWI battle river |
| YSER | Strategic WWI river |
| MARNE | Strategic WWI river |
| MARNE | WWI-WWII battle river |
| YSER | Important river in WWI |
| MARNE | Strategic WWI French river |
| YSER | River in WWI fighting |
| MARNE | River important in WWI |
| YSER | French river important in WWI |
| YSER | River in WWI battle history |
| MARNE | French river near two WWI battles |
| MARNE | River for which two WWI battles are named |
