Misc: The spaceship voyager found geysers on triton, a moon of which planet?

Questions

In 1916 Allies turned back Germans in WW I's Battle of---------- . ?

In 1939 Britain declares war on Germany. France follows 6 hours later quickly joined by---------- , New Zealand, South Africa and Canada. ?

In 1939 Britain declares war on Germany. France follows 6 hours later quickly joined by Australia, ---------- , South Africa and Canada. ?

In 1939 Britain declares war on Germany. France follows 6 hours later quickly joined by Australia, New Zealand, ---------- and Canada. ?

In 1939 Britain declares war on Germany. France follows 6 hours later quickly joined by Australia, New Zealand, South Africa and---------- . ?