Board Thread:Question and Answer/@comment-121.55.209.131-20160531035323/@comment-24999710-20160531051602

It says in game. Go to Help page > Battle > Legendary Archwitches > Reinforcement requests.

"*...reinforcement requests will be automatically sent to all members of your alliance."

what you are looking for -> "*You cannot send reinforcement requests to players outside of your alliance."

"*Reinforcement requests will only be sent if you are in an alliance"

Also, if you took a look in the Archwitch wikia page you would reach the same conclusion, because it says "You can not request help from comrades. " in the third paragraph under Legendary Archwitches.

So unfortunately no, LAWs are alliance members only. :(