I am going to assume you are playing with order delays set to PAINFUL. In this case, with only 12 hours available, you are only going to have preciously few order cycles ... perhaps just 2-4. Making the right decisions at the right time will be critical.
We'll refer to the three anonymous objectives as NORTH, WEST, and EAST. Observe the point break down, 75, 25, and 25 respectively. Clearly, you MUST take NORTH (Loenen), but you only really need to take either WEST or EAST to win. So, which should we discard WEST or EAST? I say discard WEST. Why? You have better terrain for movement on to NORTH from EAST. Also, WEST looks like better defensible terrain for the Germans. They could stop you dead (quite literally
So, we are looking at a two step plan.
Phase I: Take EAST.
Phase II: Take NORTH.
During the battle, there may be some minor refinements. For example, once you have completed Phase I, you may want to block German counter attack/reinforcements coming from WEST.
One of the first things which you need to do is set up your arty fire base. The 75mm Howitzers are not initially in range of Loenen. You'll also need to determine whether to leave the mortar platoons with their organic formations or take direct control. Given the short distances for these attacks, I would be inclined to take direct control.
You should also note that you have only two motorized units: the engineers and the ATG unit. You should have those engineers proceed to EAST and make contact as quick as possible. This will give you an idea of the German disposition at EAST. You can then begin to hit them with arty and finalize your attack plan if you are within the first 59 minutes of the scenario without penalty.
I would allocate 1 Bn to take and hold EAST and 2 Bn to take NORTH.
Some final tips ... you only have 12 hours ... so, your troops should be making a maximal effort ... meaning:
ROF=MAX
AGGRO=MAX
CASUALITIES=MAX
MOVE=FASTEST
ROUTE=QUICKEST
Well, give it a try and see how it goes.
PS: Don't forget to paint on Standartenfuhrer Spindler's CP in Loenen for me, "MarkShot says, 'Have a nice day, Ludwig!'".

