[Wdll]

Very rarely I have seen such moves (for HQ or not) work. When they do, the casualties of the attacker are much higher or they pose no threat. For example having a company paradrop and the defender simply moving far away enough to not take any fire (mobile artillery etc).
Most of the times that it works is when the opponent is not very experienced or if it is done in such a perfect way that it works but only because it worked more as a distraction than anything else.