New to Panzer Campaigns, have many questions... Let's start with HQ's

[Ricky B]

Specifically, HQs return on a subordinate unit, randomly. So wherever its units exist.

Your call if you want to tie down units "trapping" an HQ behind your lines. I have never bothered-just destroyed them, and if you don't trap it you risk it calling in artillery, air strikes, blocking a road - even though no zoc, it could move onto a road and block supply through its hex.

Otherwise, your own decision as to what do for lower versus higher level. Unlikely that you would have the option of one or the other, versus most likely both being trapped.

Rick