Kakashi Chronicles ~ Boys' Life on the Battlefield ~ Part 1

is episode 119 of the Naruto: Shippūden anime.

Synopsis
Kakashi has just become a jōnin and has received gifts from his captain and team-mate Rin Nohara. Obito Uchiha, however, forgets to get Kakashi a gift, even though Rin had reminded him earlier. Obito claimed that he would surpass Kakashi once his Sharingan awoke. Minato explained that their mission was to sneak behind enemy lines and destroy Kannabi Bridge. On the way there, the group is spied upon by Mahiru, who Kakashi attacks with his Chidori. Mahiru wounds Kakashi, and Minato uses his Flying Thunder God Technique to save him. After Minato kills Mahiru, he explains to his team that teamwork should be the most important factor for a unit. That night, Obito asked Minato why Kakashi acted like he did. Minato tells him that Kakashi's father, Sakumo Hatake, was hated and committed suicide after saving his friends instead of completing the mission, making Kakashi live his life following every rule. The next day, Rin gets captured and Obito wants to go to her rescue, but Kakashi states that they must go on with the mission. Obito tells him that he believes Kakashi's father was a true hero, and that it is more important to care about your comrades than the mission itself. The two then go their separate ways; Obito to save Rin and Kakashi to Kannabi Bridge.

Trivia

 * It aired at the same time as episode 120.

es:Kakashi Gaiden: ¡La vida de un chico en el campo de batalla! Parte I