
Originally Posted by
VincentVegas
In answer to your question, yes you can back out without penalty (same as a revenge attack).
And with regard to your 1st point the OP is correct and you seem a unclear about the CC function. Effectively you have 2 CCs one for attack (where Derick was) and one for defence. The one for defence sits in your war base and is filled on prep day, after the first defence the CC will automatically be replenished with the troops you had in there previously.
The attack CC comes from your normal village (same as the army and spells) it will contain whatever your clan members have donated to you, it will not be automatically refilled. You will need to request new troops for the 2nd attack.