Chương 1: Prologue
(EDIT 22.06.2020 :-P)
In the middle of the battlefield, on the plains of Amegakure, lays a barely breathing body of a 25-year-old man. His black-spiky hair wet from rain and blood. His black eye stares back at his numerous enemies, his other eye destroyed by a sharp object. Once the body of a perfect killing machine - now lays broken: his right arm was cut off, three long tanto blades were jutting from his chest.
His last stand ended in a pool of blood. His surroundings were littered with at least twelve bodies clothed in red-brown leather armor.
Most of his enemies, the Iwagakure's ninjas, died after being cooked alive. Other victims had decapitated various body parts. One of the ninjas impaled himself on his blade, the outcome of man's genjustu.
This man's name is Asato Uchiha, one of Konoha's elite jōnins. Father of two children. His five-year-old son Ryuichi started training this month. After the news that his sister will be born, the boy assured his father, that he will "Protect her with his life!".
Asato got the news of his wife's pregnancy two months after arriving on the battlefield of the Second Shinobi World War. In a week, he was to going to be sent for a furlough. Fate had other plans. His team was dispatched for one last espionage mission.
Four days before leaving this godforsaken land, his team got decimated by an ambush of seven teams from Iwagakure.
Standing above his bloodied body was a platoon of angry Iwagakure's ninjas. "Kill this red-eyed dog!" one of them shouted.
"He is dead already, let's go and kill some more Konoha scum." Said a bald ninja, apparently a leader of this division.
"Let me kill him! Kamizuru-sama, he killed my brother!" one extremely angry kunoichi screeched.
"Hmm, but do it fast, we don't have much time to set up another trap." replied the bald man.
With a maniacal grin, the kunoichi drew her kunai out and slowly approached an Uchiha Jōnin.
Asato promised his wife, Sachi, and son that he will return to them. The thought of them and his unborn daughter gave him strength. Seeing slowly creeping up enemy kunoichi with readied kunai, he used his left hand to set it in one-handed tiger seal and shot out a medium-sized fireball from his mouth. The last thing unlucky kunoichi saw was fire and small Uchiha™ smirk on her brother's killer face.
Iwagakure ninjas tried to help their friend extinguishing flames from her face. After a couple of seconds of screaming, flames died out, leaving another burned corpse.
At this moment, their commander noticed a small contingent of Konoha shinobi coming their way, "Shit! It's Sakumo and his lackeys. Retreat!", he joined his palms in a seal and called out: "<Doton: Daichi Ganshō>" (Earth Release: Ground Bedrock).
Asato saw two rock walls closing in on him, he could only think of his family, the last thing on his mind was 'I love you Sach-.'
*CRASH*
SUY NGHĨ CỦA NGƯỜI SÁNG TẠO 
dahnik
dahnik If you found any mistakes, then please inform me. I really don't like them :-). Waiting for your comments :-)
It's a little brutal, but let's be honest - it's a world of 13 years old children decimating their own clans. IMO war should be even more bloody.
In the next chapter, we will jump a couple of years, I don't want 5 years old child fighting on jounin levels (yeah, there're some novels like that) :-).