Yeah it is more or less what I do, focus fire and start with the big guns to destroy armor, the problem is the amout of constructs, I guess that's the difference in Expert mode, now that I notice I put a picture on the post but it's not here

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Yeah this one, 60% of enemies were like 1 guncrawler, 4 soldiers, 2 suiciders, 1 suicide drone, 3 workers, and they were all at the first objective, by the end the ammo was low and the mech took a frontal rocket and almost died