I would just like to say that the Captasus is vulnerable to Killing Blow unfortunately. Stupid FAQ. Basically because the character is listde as 'Infantry' in the army book, it doesn't matter what you put him on and what that changes his formal troop type to...
For deployment order, I vote for:
Steam Tank
Inner Circle Knights
Steam Tank
Characters
Placing the steam tanks in staggered order will influence the opponents deployment more. If we deploy them both one after the other he'll either avoid that flank or concentrate on it, depending on how well he thinks he can deal with the two tanks. It really depends on where we want him to deploy his 2 main units. If we deploy one Tank and then the inner circle knights, he may deploy more centrally (if this is what we want), expecting us to deploy the other tank on the left flank.