Nonsiege summons vs doors, walls, HQ

Can WS's summons like Mechanic Golem or Big Boom inflict dammage to castle doors, walls, HeadQuaters or Life Controll Crystals? If yes - can they do it by generall attack or only by using skills. Of course this question also concernes all summoner classes. Please give clear explaination about this, because I've heard different answers when asked this question. Some told that summons may attack only using skills, another told that all types off attack may be used against previously described target during siege.

My mechanical golem had no problems at all tearing down the inner castle door of Dion four weeks ago. No skill use necessary.

My mechanical golem had no problems at all tearing down the inner castle door of Dion four weeks ago. No skill use necessary.

Thank you, and what about HeadQuarters or Life controll Crystalls? Have you tried to attack these targets?

Thank you, and what about HeadQuarters or Life controll Crystalls? Have you tried to attack these targets?

No idea, we were just auxiliary troops and were back at guard duty of our flags after the initial break-in.

I wouldn't know why it shouldn't work, though.

you can only harm walls with strider/siege summons.

doors/crystals etc can be hurt with anything.