World war first in which year
- World war first ended in which year
- World war first began in which year
- World war first started in which year
- World war first years
- World war first and second year
- In which year did first world war start
- In which year did first world war end
- The first world war began in the year
- First world war happened in which year
- First world war held in which year
- First world war took place in which year
- First world war broke out in which year
- First world war started and ended in which year
- In which year of first world war germany declared was on russia and france