I wanted to give my dwarfs a go first, but I’m keen on Undead for 4th too. When I, eventually, get some KoW games again I’ll bring out my dead.
“Dig out” or even “dig up” seem more appropriate than “dig in with”, though. 
As it happens, I won my only game of 4th (by 1 US) so far because brick riders are fearless and could get in the Dominate circle despite having a lot of damage and a horror pestering them with lightning bolt.
In that same game I kept a regiment of fiends off my flank by shooting and wavering them. Repeatedly.
The third time they were one away from being devastated.
A dwarf captain or similar combat hero could have seen them off 2 turns earlier.
Alternatively, if they were fearless the fiends would have wrecked that flank and I would have lost the game.
Alright, a bit of an update here then.
The move went well, as moves go. Thanks for asking.
We’re settled in enough for me to figure out how to fit wargames into the new routine/life.
Including which games I can and/or want to play how often.