Upgrade heroes and use them in war?

Hej ppl..

I was just wundering if the same rules apply for heroes, Queen & King, as for buildings while updrading..
If i start upgrade on a morter ex. the morter will still work during the cw, does this also apply for my heroes?

The reason iam asking is because last time we had a cw my queen was upgrading even before the search, in that scenario she wasnt avaliable for the cw, she was simply missing on from the cw base. What if i start an upgrade during preperation day or battle day, will it then be unavaliable also?

If you upgrade a hero you cannot use it to attack with (normal and cw) until it has been upgraded.
If you upgrade a hero it will be on your war base to defend.

Well that says it all :) Thx for the quick reply , going to wait till after cw before upgrading then..