How about some strategy & tactics?

[ComradeP]

Learn when to use which units, and for what. Firing at enemy units with low SA and/or low quality units (most Soviet units and, I expect, Italian units in Sicily 43 as well) tends to get your boys disrupted for minimal gains. If you have plenty of men, that's less of a problem.

Piling poor units into a hex with a single good unit is not as good an idea as it tends to be in other wargames, but it can still work. The defenders will use their best quality value, but the attacker can target the likely good unit with direct - and artillery fire.

The combined arms penalty doesn't necessarily hurt too much as the defender. Due to using the best quality value, you might on average actually create a more effective stack. All defending units need to be disrupted or killed for an assault to capture the hex, and the system often doesn't distribute casualties evenly but lets one unit take a beating. That can be a bit odd, that even when things go poorly one unit can lose most of its strength and gain a large amount of fatigue whilst the other unit(s) in the hex are mostly or even entirely unharmed.

Don't expect artillery to be the historical killer, use it to soften enemy positions but don't expect it to win the battle for you. As poor quality units disrupt faster, it makes sense to use your artillery primarily on those and enemy artillery unless you have a lot of artillery. A poor quality unit might disrupt or gain a fatigue penalty level (and thus a firepower and quality penalty) after a good barrage, whilst an A quality units tends to shrug it off unless the barrage was truly massive, the unit has been at the frontline for a while or the unit is so small that even handful of losses result in a significant reduction of its strength.

Tanks are not superweapons, more the opposite. They're good for isolating units through movement, but they're not good at taking a position. Many gun units are also good for holding a position by having an extra unit in the hex that needs to be disrupted, but not much else.