Answer:
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Total warfare was when a country used any or all resources available for war and infrastructure as a ligament military target. This war far cause significant civilian or other non-combat deaths.They required this warfare because this would make it easier to win the war and also some never gave up with this type of war.
Those serbs were convicted of War crimes because they approve the policy of ethnic cleansing in the war.
Ethnic cleansing refer to the policy in which they massacre a specific ethnic groups in their society. This practice deemed as really inhumane so they had to be convicted because of that