Playing the same mission myself, on a rather different strategy, I saw the AI bump some isolated units into the Sollum Barracks to get murdered by my stack there. That happened on Turn 1; it didn't happen again (through a few game days of test playing). The AI was clearly sending units ahead of its scouting capability and blundered into my pieces, which is understandable since Italy has to move quick to get things done by the end of the mission.
For the next couple of days, the AI wore away at the Barracks with art and air attacks. I didn't play long enough to see a further attack there.
The AI didn't blunder into Halifaya pass and my stack there on Turn 2, and only tried attacking down the clear path a few times (not across the gullies). This is reasonable enough: they've got to block me in so I don't break out and wreck the logistic of their advance, and meanwhile they're probing with some combined air and arty to see if I'll break. Meanwhile they're weathering my defensive guns behind me.
I _did_ see a headquarters up next to the escarpment edge, which I promptly nuked with my newly arrived ships and all the bombers I could throw at it, maybe one of my arties, too. 65% strength lost, hah! It pulled back promptly to less danger. I don't think it was ahead of its crew, however, since other pieces (I discovered soon afterward) were probing down the road toward Sofafi pass, and it may have been trying to support them on a road network, in relation to a corps or divisional HQ behind it (which rolled up, not that far advanced, into my recon range soon afterward).
"Pratt creates a real, hard, dirty world that is somehow still fantastical and full of magic and mystery. Daunting, but worthwhile."
-- Vanessa Lee for Front Street