For Prisoners of War, that means if you turn enemy frontline units into routed troops they go to your hand, and if you turn ally routed troops then they go to enemies hand.
I don’t think Gott Mit Uns needs clarification(?)
For Last Stand, they have stats as if they were salvaged.
For Soldier Civilians, if you have 3 open spots in your hand then you pull 3 units, if you have 9 open spots you pull 9 units. Etc…