This is a common situation that's presented in a lot of scenarios. I usually play as attacker, with superior numbers of AFVs, infantry, and some arty assaulting across a large open ground against an enemy that's entrenched or behind cover.
What usually happens is that I attack first with the AFVs and successful in eliminating all the enemy AT assets, leaving my AFVs free to mess up the enemy infantry. However, when i order my men to attack across the field, usually they got pinned down and unable to advance. This happens even when i have a large number of HMGs and AFVs providing covering fire. What usually happens is that I think I have all the enemy pinned down, but when they see my advancing infantry they take potshots at them, making my infantry want to try and sneak or run back to the rally point.
The expanses are usually 500m or more, leaving short 40-50m hops using advance taking a long time. Halftracks don't work well, b/c there are still ATGs around to mess them up (tho they can't do anything about the tanks). Smoke lasts too short, and arty also provides only a short period of reprieve.
Suggestions?