You would be surprised how many lords fight wars just for the sake of fighting.

[Kenshin, who earned the nickname "God of War" came to mind.]

Or solely out of greed. The wars can continue on forever as long as they benefit from them.

[How many times did the Oda forces have to take down such Daimyo so that their people didn't have to suffer too much? Mitsuhide had lost count.]

My lord, Nobunaga, wishes to unite the country once again so that those wars can finally stop.