Second Shinobi War
The second war broke out twenty years after the first one ended with the Armistice Treaty. This war broke out mainly because of the economic disparity between the countries, and countries tried to expand their territories by using Military forces. Also, the conflicts between Konohagakure, Sunagakure, Amegakure and Iwagakure didn’t help in sustaining the peace. Majority of the war took place in small countries, like Amegakure.
Eventually Konohagakure were the beneficiaries of the outcome of the war. This war saw the rise of many heroes like the three Legendary Sannin of Konohagakure. Orochimaru, Jiraiya and Tsunade Senju. Tsunade introduced the system of a medical ninja in a team which saved many lives. Jiraiya took care of the Amegakure orphans, one of whom was Nagato, who later killed him. Also, Sakumo Hatake made his name as the White Fang of the Leaf during this War only.