Well its not turn-based but you don't build things either. You can control up to 4 squads in the campaign and order them about like in any other rts game (c&c, dow 1, warcraft etc). Each squad has a leader in it.
None of the leaders can die. They just get incap until another squad revives him or you use a healing item that the commander starts with. Cover is the most important part in the game as without it, it be very hard to kill all the squads unless your using people good at melee (commander and assault squad are melee).
Basically you move each squad around like on c&c and such taking over beacons so if you lose any squad member he come back at it. And at the end of most levels there are bosses you have to kill to complete it.
My explaining is quite crap but hopefully that give you an idea on what it is like
I try and find a video later as that can explain it better.
The best part is you can play the campaign with another person. With you controlling two squads and the other person controlling two. Also in the campaign each leader of the squads level up giving points in health, ranged, melee and energy (magic etc). In each of these sections theres traits that the leader can use during battle for example the devastor squad can use sprint making them run faster but will lose energy.
Available squads in Campaign:
Force Commander with whatever you call him (the leader) Starts Melee but can be changed to Range.
Tactical Squad with Tarkus (A normal group of up to 4 troops including the leader Tarkus) Starts Ranged but I think it can be turned to Melee.
Devastor Squad with Avitus (A heavy support big minigun up to 3 troops including the leader Avitus) Is ranged and should stay like that. Don't think this squad can be changed to Melee.
Scout Squad with Cyrus (No need to explain what these do but they have 3 or 4 members forgot)
Assassult Squad with Thaddus(Melee troops that can fly in the air, have up to 3 members)
Dreadnought (A big mech machine thing that is good in both ranged and melee. Haven't got it in the campaign yet but I know its playable)
Hope all this helps. Not sure if I spelt all the leaders names right but its the best of my abiliaty (my spelling is off today it seems)
Heres a video I found from a quick search showing the gameplay:
http://www.youtube.com/watch?v=_6BUKmQL ... re=related
. Now I have seen everything.
Goddamn, you gotta respect em for the excellent work they put in Homeworld, Company Of Heros, AND Dawn of War!