Just a few points points to add:
Those big tanks in the final push are a real killer. They don't play fair and come down the drive; they bust through the walls either side of it (? East entrance?) and cross the grass. So, when mining the gate areas beware of this.
You get one batch of reinforcements for each 50 kills (up to max of
. Keep your eye on the counter and call them in as soon as you can.
There are crates of mines (tank and personal) near the main building - roughly SE of where the final cut starts, near a watchtower. Use your prep time to lay these as far as poss. with the heavy tanks in mind.