Last level of US Campaign

[Weirderal]

So I'm on the level Turning Point, and I've reached a dead end.

(Please, read everything if you're going to make any suggestions)

After making it through the heck that it the first half of the level, I survived to the point where it's time to counterattack.
I had about 16 tanks. (Ask for screenshot if necessary.)

A Tiger tank was inside the supply base yet; I took out the turret, and repaired it to use myself. I charged into the right side of the enemy base, and I somehow managed to do a lot of damage: I took out the Pak 35-something cannon, the vehicle behind it, the Sdkfz, and other vehicles on the left side, except for the StuG 3 and Tiger tank. They blew the tank to bits. But I had done a lot of damage, so I didn't reload to beforehand.
Now, I don't know how I got so lucky here, but I had a M8 Scott, which I figured was pretty useless. (Turns out they're pretty darn powerful.) I brought it up the less-defended far left side of the map, and I took out most of the vehicles there, too. I took out most of the remaining vehicles with a Mark 4 Churchill and an M7 Priest.

So now, there was just two tiger tanks at the top, and 3 of my vehicles in the area around them. The Scott and Churchill were too weak to penetrate the Tiger's armor, and I had the Priest shooting at one repeatedly from behind a building, which wasn't doing damage. At some points, the enemy was unloading the troops from the tanks to repair them, and I would blow them up. I'm not sure of the fate of the left tank, but I left it in a repairable state. The other tank had lost all but one crew member, and the instant he got out to repair it, I got the "Mission Objective Completed" for destroying the German division remnants. (I then killed the troop trying to repair it.)

The problem: I did not have the "destroy the artillery" objective completed. All troops were gone. I owned the map. What's wrong? Do I have to do this all over again? I've probably spent about 4 hours on this level, and it was difficult enough to get through the first part...