When planning a close assault (even without suppression
effects for vehicles), you should always try to chew up
the enemy unit with all possible ranged fire first, and
then commit to the assault.
Improved realism in the line-of-sight and spotting rules
make scouting even more important. When going up against
enemy armor or AT guns, always lead with infantry or fast,
cheap scout cars to sniff out those ambushes.
Be very careful with the HQ supply rules, especially if
you are unfamiliar with East Front. If you are not careful
or used to dealing with supply in platoon-level games, you
can find yourself high and dry very easily.