They cost 60 munni. But yeah, I think they immobilize everytime.
Wouldn't be so bad if it wasn't a doctrine only thing, because... damagewise they aren't even an improvment (neither munni wise), you can only lay them with one special Unit... it's not faster... almost the same. The doctrine feels wasted for that.
A + for the RiegelMine might be that the enemy can't see that you lay it. But I am not even sure that this is true.
