which way do you order your reinforcements??

[Dark Water]

There's no way of actually ordering in reinforcements in STW, right?

Clicking a button which will make the reinforcements appear?

Yea you just clicked the button and they would appear in a "pick n mix" fashon, 2 yari ashigaru (peasants) would appear when you could really do with 60 heavy cavalry (as was the size back then) would appear... it made the battles interesting to say the least....