Bingowings said:

In the comic book adaptation there was a small Rebel outpost (which possibly tended to the generator station) which is destroyed by the probe droid to cover it's tracks, the loss was put down to a Wampa attack.

I thought it was a good idea when I was ten but without the Wampa sub-plot the effect would possibly be to bring more attention to itself.

It never made the movie so I guess it was dis-reguarded as irrelevant .... Looks like they had enough problems just doing the battle footage without adding anymore in.... The fact the probe discovers the shield was enough to convey the message and lead to the invasion.

It just fell over on the Invasion, I never thought about it that much until I pulled the footage apart.... Do you think it would help to have distinguishing marks on which group of AT-AT's you were looking at? So you would know where you are in the battle somewhat because it is all snow and blue sky....