Pip,
In my experience, artillery is the best bet and several pieces plotted on them in the same turn will take sps off the 88s quickly if you have LOS.
Otherwise, direct fire from large bore AFVs (76mm+) will do the trick quickly too.
In fact, I have found that keeping 88s
alive is much harder than killing them. I tend to deploy 88s only in areas, mostly on flanks, where 1) they cannot be overrun in one turn (e.g.: woods; bluffs, etc) and 2) where LOS is very resticted to prevent the enemy from simply spotting them at great distance for artillery plotting.
If you have 88s hidden in woods at bottlenecks with limited LOS and infantry support, they can really be nasty beasts for the opponent to get around. :boom3:
Even then, at best they will merely slow a determined foe rather than stop him. As soon as enough enemy infantry comes up, if the enemy has arty, the 88s are toast.
Thor