Vlajdermen
Arcane
Any tactics games that take place in WW1? Either Myth 2-style RTT or Pathway to Glory-style TBT will do. Fan games, mods, and total conversions will do as long as they get the job done. I'll even take an RTS, since most of those are just RTT with base building (before you bring up Entente: I tried it and it almost bricked my computer.)