I just wish I knew WTF was going on. Had to take a break from COD, and jumping into the BF series for the first time is pure
I feel you.
You can use the opening cinematic as a clue to what you'll be doing.
Listening to the explanation of the 3 locations, you'll hear narrator either explaining that "we will bunker down and defend here, if we get pushed back, we can hold up at this location" -
That's a hint that you will be defense and you should be trying to defend your point and lowering enemy tickets.
If the narrator is explaining that he expects "we should be sending all our units to take over this location, when we are successful, we will continue to push the enemy back until we have captures their territory." -
That's a hint that you are the attackers and you need to take over the points
It's the best mode for what is probably the closest thing to a true tug of war simulation of trench warfare.
It would have been better if it allowed the defense to push the attackers back though.