Russia was called The Soviet Union in the past when they were communists
The Crusades is the series of wars between the two groups but if you're looking for a certain one I can further elaborate.
The enlightment was a French Movement that rebelled against authorty and promoted Humanism.
Because it was an easy source of water for their needs that required it and it was also and easy way to transport supplies to the battle sight if an army was in a foreign location. Hope this helps, if you need clarification let me know?
