Hey! I'd recommend being a bit more clear in your question. Which faction are you playing as? How many players are in your game(1v1, 2v2, 3v3, or 4v4) If you'd like an even more specific answer, you can upload a replay and make a thread in the Replay Reviews Section.
In general, I'd say that there is a huge emphasis on targeting high damage squads first. As the Germans, especially Ostheer, you're going to want to have an MG42/34. Definitely use that to make those high damage squads (flamethrowers, sub machine guns, light machine guns) suppressed so they're less effective against your squads (which are typically better at longer ranges).
Also, with regards to flamethrowers, soldiers take heavier damage from flamethrowers when they are in buildings or behind heavy (green) cover. If you're fighting a blob of flamethrower infantry (or even one) it's actually better for your squads to be outside of green cover. There is actually a damage reduction from flamethrowers when your squad is standing in water, which only a few maps have.
I hope this helps!
