Okay, I understand now.
I just checked my notes on the Arnhem - Historical Campaign. The one and only time I played it was on 07/29/03. My notes are not very detailed. As best I can determine the fire bases were to the South of Arnhem along Hell's Highway.
Here is an excerpt from my review of the scenario while beta testing. No, I think I'll give the whole summary:
----- my summary -----
Arnhem - The Historical Campaign (Allies, Painful)
A decisive victory! (Sort of my first play through as the first effort I aborted in Day #5.) However, I made a few mistakes in the last 24 hours (which were compounded by order delays) and as hard as it is to believe, I seized the main objective only minutes before the end of the scenario.
Too much happened to try write an AAR.
However, I will try to briefly summarize some key points.
(1) Despite whatever I did, it didn't seem that it was possible to accomplish very much until Day #5. That's when my arty, armor, and motorized infantry began to arrive. Prior to that, it seemed the best thing to do was to try to dig-in and keep out of trouble. I did try to block off various road junctions in the early days. I think that was effective, but only for a day or so. It seems that a Bn blocking a road will slow down the AI, but it will find a way around. If the battle had only lasted two days, then maybe the road blocks would have had an impact.
(2) Around the middle of the scenario, I used most of my para and glider troops to take the Rail Bridge.
(3) For the 5th. to 9th. day, I pushed on Arnhem from three different axis of attack (South, East, and West). I would see progress from midnight to the mid-morning. At night, my movements were harder to spot and allowed me to close with the Germans despite their massive arty and ammo depots. In the morning, I had my own arty support until it would be exhaused by noon. After that, I would be battered and thrown back.
(4) On the 9th. day, the noose tightened around Arnhem and perhaps German artillery was somewhat disrupted in the city.
(5) On the final night, I got in contact with all my commanders. I told them that tomorrow would be the big push: do or die. Every available unit was to push into Arnhem. As soon as artillery support ran out, any security detail for the fire bases would be added to the attack. Arty batteries would relocate at various points along Hell's Highway to secure it with whatever small arms they had available.
(6) Despite some confused and overly zealous orders (like giving up the Rail Bridge) on the final day, the raw drive of the troops carried the day.
I am sorry, but it's not much to help with your question.
Never more! (I've had enough. Sliterine has raised mediocrity to an art form!)