[Mobhack]

I haven't seen any reluctance for crew to re-man their artillery if they abandoned. Though its usually German, Allied crews with decent rally stats. Those will re-man after 3-4 turns being left alone - often in a turn or 2 if Germans.

What may make some camp out is if they have reached 50% damage - troops with 50% or more damage are noticeably less easy to rally, and may go into "perma-pinned" status if of low morale.