How to create special units?

[wisecat]

I still hope that scenario creation will someday become possible....
so: my big wish is to create a WWI scenario.
Hence:
is there a way to create an effective representation of landmines and barbed wire and poison gas?
one of the necessesary qualities of the first to should be that after travelling onto a minefield or breaking through barbed wire units should still be able to attack, although their health will be reduced.
Any ideas anyone?

[Gramphos]

If you create a defensive unit with 0 movement, you might be able to make it a minefield. If the units are made barbarian only it can't be built, but placed on different tiles. Then it is just to set it to hidden. It is harder to balance the defense/level of it to make it die before the attacker, but hurt the attacker.

What do you think?