General Sherman adopted the policy of total war because he wanted to make the war a very bad experience for the Southerners, so that they will be quite unwilling to go to war in the future.
General Sherman was an American soldier who served as a general in the Union army during the American civil war.
Answer;
Vikings accepting Christianity
Most important event during the period of European invasions is the vikings accepting Christianity.
Explanation;
At the beginning of the Viking Age, almost the entire population of Scandinavia was pagan, however the vikings had many Gods and it was not a big deal for them to accept the Christian god alongside their own.
The conversion of Vikings to Christianity occurred without violence, by the end of the Viking age most vikings had become fully Christian and were baptized and buried in that faith.
Agricultural communities settled where they did because there was a water source near by for growing crops. It is very hard to grow plants or raise animals without a water source. People also settled near water sources so they could travel on ships and trade with other communities along the same water source. The people in the community also needed water to stay hydrated and to wash dirty clothes or to bathe.
It murdered thousands of innocent people, turned into an illiberal mess of collectivist radicalism disguised as enlightenment, produced a military dictatorship, ended with complete and total military failure, and resulted in the Bourbon Monarchy being restored.