Hundred Years' War
5 countries took part.
Read about Hundred Years' War on Wikipedia
| Country | Years |
|---|---|
 Belgium
|
1337 to 1453 |
 France
|
1337 to 1453 |
 Portugal
|
1337 to 1453 |
 Spain
|
1337 to 1453 |
 United Kingdom
|
1337 to 1453 |