i got a tip for u guys . ->
buy an engineer first things first, and dig two trenches on either side of the map. Next buy, in this order, 1 officer, 2-4 medics, 2 snipers, and a signaler. Sometime in there, preferably between the medics and snipers, build a bunker in the center, near the bottom edge of the map. I use this bunker as a "field hospital", putting the medics in there and leaving them, and sneding any wounded soldiers to them to recover. with 4 medics it doesnt take very long to heal wounded soldiers. After getting the signaler, get 3 regular soldiers and keep them in the bunker, rotating them out with wounded soldiers to keep your trenches full. This both keeps your front lines at maximum firepower, but also gives you fresh soldiers in case of a grenade strike or arty wiping out your trenches. thats my helpful suggestion. i lasted 1 - 2 hours with it.
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