Sequel of nobunaga ambition. There are more diplomacy and tactics options. In this game you play as the daimyo and the generals (the first one is like the "omnipresent" daimyo), so pay attention to the loyalty of your samurais giving them money or tea ceremony items. Don't forget to recruit the "ronins".
Buy rifles to take advantages in the battle field (hope for a sunny day) and use horses, ships for mobility.
Micromanagement can be a problem, but you can delegate "fiefs" to your samurais to resolve this (remember: if the have low loyalty they will betray you)