After the initial uproar subsides, the Shogun calls all his retainers for a meeting, in order to assess the situation and decide on a cource of action.
Ashikaga Yoshiharu: ...you two are the only ones here?
Masakado: You don't have any other retainers besides myself, my Shogun.
Princess Eiju: I came because I was bored.
Ashikaga Yoshiharu: Bah. In any case, everyone and their cousin has declared war on us. Isn't there something we can do?
Princess Eiju: You could send out a nationwide demand to cease hostilities. They are your subordinates, after all.
Ashikaga Yoshiharu: Good idea. Give me some ink and paper.
Yoshiharu writes a letter to each of the clan leaders. No one replies.
Ashikaga Yoshiharu: Pupiiii!
Masakado: At this point, they are not going to listen to anything you say. We should be the first to make a move by capturing the provinces around the capitol. I am certain that the major clans will not expect swift action on your part, considering how weak the Shogunate is in their eyes.
Ashikaga Yoshiharu: We do have some sort of army, don't we?
Masakado: No, we do not. However, Kyoto has a long military tradition and the best military instructors and compounds. Should we restore them to active use, we will have a definitive advantage over other clans.
Ashikaga Yoshiharu: Tohohoho. Good. Go and make it happen.
Masakado: As you wish, my Shogun.
Princess Eiju: What about you?
Ashikaga Yoshiharu: I was thinking of another shogi game. Up for it?
Princess Eiju: Some warlord you are... and yes.
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After a mere season of preparations, Yoshiharu and Masakado move their freshly assembled group of ashigaru to the east, in order to assault the closest nearby city.
Ashikaga Yoshiharu: Oho. What have we here?
Masakado: It appears the city has recently been taken by the Hattori, my Shogun. We should strike immediately, before their forces recuperate.
Ashikaga Yoshiharu: You do that. I'll watch from right over there.
Iga Oboro: My lord, we are under attack by the Shogunate! They have breached the southern gate!
Hattori Yasunaga: The Shogunate? Are you sure? I never imagined they would have the nerve...
Iga Oboro: We have just finished the siege of this fort. Our troops are not in fighting condition!
Hattori Yasunaga: Assemble them here and order them to stall the enemy.
Masakado: The Hattori forces have surendered, my Shogun. You can come in now.
Ashikaga Yoshiharu: Tohoho. Quite satisfying to catch the ninja clan by surprise. What of the leaders?
Masakado: Their bodyguard is slain, but it appears they have both escaped.
Ashikaga Yoshiharu: I expected as much.
Masakado: Should we organise a pursuit?
Ashikaga Yoshiharu: No, organise a celebration instead. Japan has just had a taste of the Shogun's power!
Masakado: ...