First tip is don't immediately attack the Oda army that is just within your borders - instead move your army between it and the castle.
At least in my first campaign at legendary the Oda army then moved east to join another big Oda army in the forest NE of your castle.
This left their Owari castle undefended and I took it easily in Turn 2.
Exempt Owari from taxes and move your Metsuke and more troops recruited in turn 1 up there and the unrest problem will disappear without a rebellion.
However you then find yourself in exactly the same position as the Oda are in after they've taken Mikawa - there is a big Imagawa army amassing at Totomi which will attack you in another couple of turns and you can't possibly build enough troops to hold it when they do attack without weakening your hold on Owari.
And unlike the Oda you have too pay full price for bog-standard Ashigaru and your special Ninja units and diplomacy advantages are useless in the early game.
About the only strategy I can think of is sending a force (2 or 3 yari ashigaru will do if its undefended) to take Suruga before the Imagawa attack you first.
They might then abort their plan to attack Mikawa and Owari and give you a few turns to build an army there big enough to beat them when they do come back (looting and abandoning rather than defending Suruga might also be a good idea - if you try and hold it then the Takeda or Hojo will attack you there anyway - whereas if a rebel army takes it instead they can form a buffer for long enough to beat the Imagawa at Totomi.
But even if you do destroy the Imagawa you will still be in the same position as the Oda would at the same point in the game - for some reason the Takeda and Hojo would much rather attack you than each other and in the north either the Hattori or Ikko Ikki will start sending armies against you soon enough.
Bookmarks