There is a great deal of information on this webpage here

Tips for Quick reading about CJ

You want to send out as many troops as you can for CJ.  ONLY TROOPS LEFT HOME ARE MARKSMEN!

You do want to keep your best 3 heros home, with focus on Defending the castle.

Sending a defensive formation will help score more points and keep your ally in the CJ rounds longer.

Troop formation of 90/10/0 is your end goal for ideal troops in all 6 marches!