These mods are made in an attempt to make the defensive works less obvious and spottable in game. I have often thought that trenches and foxholes looked too unrealistic and were way too easy to spot.
These mods are based on Aris´ great terrain mods and are as such probably best used in conjuntion with these.
If you have other terrain mods in your z-folder you should probably place these files in a folder named “zz”
Umlaut
https://drive.google.com/open?id=1svaTH_sk3etFJMIvqqQGtctbs0A5j93Z