The answer would be "The battle of the Bulge". This is also the largest Ardennes Offensive which was the largest battle fought on the Western Front in Europe.
Which war? World war 2? If world war 2, it was due to the fact that their home towns were in rubble, and were looking for a new home for them, and their family.
2/3 I'm pretty sure but i could be wrong
Answer:
The movement of pastoral peoples for thousands of years also served to diffuse Indo-European languages, bronze metallurgy, horse-based technologies, and more all across Eurasia and getting things to harsher places who couldn't get certain things in their empires
