Ok, Rebels are moving in for a surface attack as the army clears the jungle.
The following was just posted in the Rebel thread; just take it from the other point of view to them.
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That being the case, there are three units covering the artillery.
First is the Stormtroopers. But personal blaster fire is VERY ineffectual aginst ship shields, and stuff like the E-Web blasters are not designed for aerial targets. Not since the Clone Wars have troopers been routinely equipped with anti-air stuff.
Secondly is the AT-ATs. Their guns are very powerful and could damage you. But again, they are not designed for anti-air use- they are slow tracking. If you actually atttack an AT-AT, you have to fly at it and it can get a bead on you. Other than that, their fire will be ineffectual.
This leaves the AT-STs, which they have moved up to cover the artillery. These have reasonably powerful guns and are fast tracking- and there are enough of them to cover all angles (except vertically above, but as you aren't in atmospheric craft you are not built for dive-bombing, which would be more like dive-suiciding)
They will be your main threat. Not a great threat, but a torpedo run on the artillery (the most effective way to damage it) requires a straight run whilst you targeting computer locks on.
Strategically speaking, there are three units of artillery. Successful bomb runs will cause damage based on your payload rating. Enough such successful bomb runs will knock out one of those units, not only just for now but also for the main battle to come.