Need help..

[Imp]

Plan ambushes and stack your units. Keep other units nearby to support your squads and flank theirs. A successfull stacked ambush with falnking support can eleminite 8-10 men in a turn.

I would say generally if its possible to give cover fire from adjacent or near hexes try not to stack much if attackers survive or more follow any attack on the hex will suppress both & be very nasty if its an engineer or armour that follows. As you are tightly grouped his arty can have great fun as it can concentrate its fire if your opponent adopts this tactic ignore them & just barrage them out of existence.
Very rare I will stack infantry except in the act of attacking because need to target him. Tanks in pairs but only if I have no other choice 100m apart stops splash suppresion.
If you try this verses a human with 3 or 4 units round every corner rather than using terrain effectivly you will get a couple of units but what will happen is the game will slow slightly & you will die fast as he uses the correct tactics. Now Z fire & arty are incredibly usefull tools goodye. 6 tanks or infantry in 3 adjacent hexes 2 80mtrs or a bit of spraying with a MMG will do the trick now just killem they wont fight much & will probably miss.