19 AHV: Reign of The Second Hokage
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#Tobirama was a firm believer in the Will of Fire — a philosophy that held that all villagers of Konoha were part of one large family, as such was chosen as the Second Hokage of Konohagakure by their Shodai Hokage.
#As Hokage, it was not only his responsibility to protect that family at all costs but also to encourage the disparate villagers of the same view: to move away from the idealism of only thinking about their clan and that they should think of the village as a whole.
#So Tobirama Senju's role as Hokage mostly included helping Konoha's shinobi transition from valuing their clan above all else to valuing their own village and everyone in it.
#To this end he created institutions such as the Konoha Academy, the Anbu, Jōnin Standby Station, etc to create relationships and good-will between the different clans inhabiting Konoha.
#While largely successful, enough that other villages adopted the same organisations and it also showed good results, the Uchiha clan however resisted it, due to the loss of their autonomy; due to these organisations. It was for this reason that he came into conflict with the Uchiha clan so frequently, as he felt that they too often valued their own desires over others'. This often gave him the appearance of being prejudiced against the clan and its members, but he was in fact perfectly capable of spotting and happy to cooperate with any Uchiha that could overcome their "Curse of Hatred"; he cited Kagami Uchiha as a perfect example of this transcended Uchiha.
#The Second Hokage orders Anbu, codenamed Baku, Ushi and Tora to keep an eye on the Uchiha clan in order to prevent them from rebelling again.
#Due to Tobirama's policies, Setsuna Uchiha starts having doubts about the Second Hokage so he plans to reclaim power from the Senju clan.
#Uzushiogakure actively participating in the war due to Ashina being enraged at Hashirama's comatose state and agreeing to Tobirama's orders to fend off Kirigakure's fleets that were trying to take advantage of Konohagakure's weakened state due to the death of Sasuke Sarutobi, and Hashirama Senju being in comatose state. And as such acquire control over port cities of Land of Fire .
#Kiri fleets receiving huge losses at the hands of Uzushiogakure Shinobi.
{{{A/N: Ashina and Mito were siblings, as such he deeply cared for her.
Ashina died at the age of 67 probably during the Second Shinobi World War, which means at the time of the Foundation of Konohagakure, he must have been in his 30s. That's why I think both Mito and Ashina are siblings. Ashina probably lost his hair colour in the same way how Nagato lost his own.}}}
20 AHV: Konoha Military Police Force and Sanins
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#The Second Hokage already wary of the Uchiha because of his history with Madara, created the Konoha Military Police Force for the Uchiha to run, publicly as a sign of trust but primarily so that the Uchiha could focus their energies into something beneficial. Others, however, would come to see this as a way to marginalise the clan.
#He even recruited Kagami Uchiha, whom he believed has transcend from their clan's Cursed of Hatred, in his guard unit to further earn the trust of the Uchiha clan.
#Like Hashirama before him, Tobirama tried to foster good relations with the other villages and end the war as quickly as possible.
#Hashirama Senju awakens from Coma after his body finally heals itself from Chakra poisoning but it shortens his life-span by a significant amount.
#Hashirama Senju was forced to retire from active Shinobi life.
#Birth of Sanins, Dan Katō and Hiruko.
{{{A/N: This is the only way that Hashirama could have enough time to spoil her grandchild Tsunade otherwise how can a Hokage could have enough time to do something like that in war time. It won't make sense and the other reasons is the backlash from his self-healing which shortened a significant amount of his life span. So he retired.}}}
21 AHV: Chunin Exams and Land of Neck
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#Tobirama creates Chunin Exams as replacement for 'War For Supremacy' fought by the different clans within his village during the missions, trying to outdo each other, thus sometimes compromising the mission itself. It wasn't until the end of the Third Shinobi World War, that these exams will be opened to all villages and started being held bi-annually, with each village taking turns for hosting responsibilities. These shared exams will improve relations between the villages, present up-and-coming ninja to clients, and create an opportunity for gambling.
#Kosuke Maruboshi makes a reckless decision that cost him the lives of his teammates. Ashamed of this, he felt he was not worthy of being promoted beyond the rank of genin, thus later became known as The eternal Genin of Konoha.
#During this war, the Land of Neck was attacked by the Yugakure to take over their territory and incorporate it in Land of Hot Water. When the attack happened the civilians fled while Kōza Kubisaki with his army tried to stop them, the then Civilian Chief of the Land of Neck offered Uzumaki clan all of their money in exchanging of giving them sanctuary in Land of Whirlpools. At that time, Ashina Uzumaki knowing that he will be in need of Civilians to become a fully functional hidden village and for increasing their military strength by training them and incorporating them in his Shinobi forces, welcomed them with open arms and instead of taking their money he provided them shelter, food and resources without any conditions and free of coast. Why you ask, because by the time Uzumaki clan terminated it's Isolation policy, it was too late, most of the clans have already joined other hidden Villages so he had no choice but to use civilians, provide them with shinobi training and later incorporating them in their Village to increase it's military strength.
Seeing the generosity of the Uzumaki Clan, the Tatsuguchi clan revelead themselves of their identity to the Uzumaki Clan, overjoyed and astonished after finding out that such a famous and renowned clan is going to join Uzushio, he announced about it to the world with great pride.
This led Uzushiogakure to be known throughout the world for their Fuinjutsu, Kenjutsu and Medical Ninjutsu.
#It was at this point that the other Hidden Villages started viewing them as a major threat since they feared that Uzushio is becoming too strong.
As they already possessed the best Fuinjutsu users with ridiculously large chakra reserves and the best Kenjutsu users who were second only to Tobirama Senju in lightning release techniques and now they also have also gained the best battle oriented medic nin's clan. They thought that with their help, Konoha might become too powerful to be stopped. So they started waiting for a chance to destroy them.
#It gave Konohagakure and Uzushiogakure an edge in the war over the other villages.
{{{A/N: The Land of Neck (首の国, Kubi no Kuni) is featured in episode 194 of the anime. Kōza Kubisaki was the daimyō of this land 50 years prior to the start of the series. I copy-pasted it from Naruto fandom.}}}
22 AHV: Death of Mū and Gengetsu Hōzuki
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#During their reign as the kage of their respective villages, both of them fought each other many times, learning about each others secrets and developed a mutual enmity against each other. From this rivalry, Gengetsu also came to knew Ōnoki when the latter was a child and had constantly picked on him.
#The Second Tsuchikage Mū passed on the secrets of the Second Mizukage to his disciple Ōnoki.
#Gengetsu possesses a strong sense of honour, as such he came to despise Mū who believed in using underhanded tactics to win a fight and Mū despised Gengetsu for not being able to defeat him in battle.
#Eventually, Mū learned enough about the secrets of Gengetsu from their fights and managed to kill him, albeit at the cost of his own life.
23 AHV: Kinkaku And Ginkaku
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#Ōnoki becomes the Third Tsuchikage.
#The 'Future Third Mizukage' finally becomes the Third Mizukage. He later on create policies which gave birth to discrimination of bloodline users in Kirigakure due to his hatred for Gengetsu who was also a bloodline user of the Hōzuki Clan.
#The war continues and the Land of Hot Waters annexed the Land of Fields into their territory.
#Kakuzu witnesses the pseudo-Jinchuriki prowess of Kinkaku and Ginkaku.
24 AHV: The Last stages of the War
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#The Second Hokage eventually became convinced due to the continuous support received from Kumogakure and planned an alliance between Konoha and Kumogakure, but during a formal ceremony between Konohagakure's Second Hokage and Kumo's Second Raikage, the Gold and Sliver brothers staged a coup d'état that left them on the brink of death.
#The Kinkaku force cornered the Second Hokage and his Escort Unit, which were Team Tobirama, Danzō Shimura, Torifu Akimichi, and Kagami Uchiha respectively.
#With no way for all of them to escape, Tobirama takes a test from the members of his escort unit and asks who want to volunteer himself as a decoy.
#Hiruzen volunteers himself claiming that since he is the strongest of the group, he can escape them.
#Tobirama witnessing the conviction of Hiruzen passed the title of Hokage to him, if he were to die and also entrust the future of the Leaf, surprising the entire group and volunteered himself to act as a decoy in place of Hiruzen.
#Tobirama somehow manages to kill the entire twenty highly-trained elite members of the Kinkaku Force and later holds his own against the Gold and Sliver brothers, who were wielding the Treasured Tools of the Sage of Six Paths, for sometime before being killed by Kinkaku.
{{{Note:-Treasured Tools of the Sage of Six Paths are a set of powerful tools said to have once been wielded by the Sage of Six Paths himself. They are considered the most powerful ninja tools, and it is said those who demonstrate their POWER surpass even the Five Kage.
And a group like the Kinkaku Force must have been entirely composed of either of A-ranked or S-ranked shinobis.
So it must have been a one hell of a fight fought by Tobirama.}}}
#Hiruzen APPOINTED as the THIRD HOKAGE at the age of 21.
#With Hiruzen having beaten him to the title of Hokage, Danzō began planning to someday attain the title himself. To this end, he will go on to create Foundation and will do every immoral thing to gain support for claiming the Hokage title for himself, even interfere in foreign affairs that has nothing to do with Konohagakure and Land of Fire as well as abduct various citizens and Shinobi of Konoha itself for the recruitment in Root or for experiments.
#Konoha blaming Kumo for the death of their Second Hokage, renewing hostilities.
#The experiences of this war led to the birth of the tactics that still form the cornerstone of warfare in the Shinobi World.
#Hiruzen utilising those tactics and devastating their enemies and earns the moniker of 'The God of Shinobi' due to the huge losses their enemies suffered at his hands.
#With Hiruzen having beaten him to the title of Hokage, Danzō vows to someday attain the title himself at any cost and begins planning.
#Kumogakure sending their Jinchuriki to destroy the advancing troops of Konoha but the Uzumaki clan neutralize it, causing the Kumo shinobi to hold a grudge against Uzushiogakure.
#Konoha domineering the war on all of it's fronts, prompting the Second Kazekage to call another Five Kage Summit for peace talks.
#The Five kage decides a neutral point and meet there for the peace talks.
#It ended with an armistice treaty, but only after all of the Five Great Nations had been seriously damaged.
#The Senju clan were reduced to less than seventy active members in their clan by the end of this war.
##Attendents for the Summit
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Kage - Advisor/Guard
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Third Hokage - Danzo Shimura
Second Kazekage - The future Third Kazekage
Third Mizukage - Unknown(Steel Release user)
Third Tsuchikage - Explosion Corps Head
Third Raikage - Eight-Tails' Jinchuriki
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#The First Shinobi World War finally ends.