Because of the lack of staff teams I had Arty range in each turn but made the Cav recon and they lifted gone to ground and or helped the Arty range in. I also gave all field guns firing direct fire (out to 24 inches ) Shrapnel rounds that doubled the rate of fire per gun. So the two Belgian guns and the two MG’s ( oh and went back to 0 shots if moved) did most of the killing. I also gave the Belgian’s two forts as the fight was around Liege with staff teams but the Germans with Infantrie Vor ( Kinda like Avanta) kept moving up. So the Arty had to keep ranging in each turn.
In the end there were just too many Germans for the Belgians to stop.