Seems like any fixed system like a howitzer would be vulnerable from air attack. You would have to have total air superiority to rely on them for very long.
Ukraine has Stinger SAM's which have opened up a bunch of air space so for now the regular artillery is working. The Stingers were how the Afghans got the edge over Russia back in the day and they still work pretty good.
Never Trust Government
"You can be broke but you cant be poor." Ruthie-May Webster
