In mountainous terrain, the resupply of light infantry forces penetrating deep into enemy territory is a significant problem, David Grossman (On Killing) notes, but, as Rommel relates in his Attacks, his troops’ momentum let them rely on enemy supplies:
He and his men made good use of captured enemy pack animals and bicycles during attacks. (Had he needed vehicular mobility it would have been readily available to him by using the vehicles captured in his ambushes, but his strength was in his ability to approach from unexpected directions over rough terrain.) In a later operation they were even able to use clean, dry underwear and sleeping gear from a captured Italian laundry depot, and on several occasions they came to rely “on the abundant weapons and stores of ammunition” captured from the Italians. The most common enemy asset, and that which seemed to have given him and his men the most joy, was the enemy’s food. “The contents of the [captured] vehicles offered us starved warriors unexpected delicacies. Chocolate, eggs, preserves, grapes, wine and white bread were unpacked and distributed. The worthy… troopers… were served first… morale two miles behind the enemy front was wonderful!”
That Italian military in both wars was totally incompetent. The Italian Military Enigma, they call it, and learned papers have been written on the subject.