During a clan war, sometimes I can't use my full clan castle during an attack. It doesn't even show up in my line up during the attack. How can I use it during attacks.
I suspect the problem is a simpler issue than others think... if you have too many different KINDS of troops, you may have to scroll right on your troop attack bar to find all of your troops. Spells usually show up on the right and I have paniced myself when I couldn't find that one spell I really needed.
So... try scrolling right (or left) on your attack bar.