After two weeks of hard fighting, and two mistaken expectations of victory (see here), 4 December 1941 was the day Panzergruppe packed it in outside Tobruk. The war diary of 90.lei. Afrika-Div. notes how the division, together with the equally hard-hit Italian Bologna division was expected to undertake another attack to clean the remaining enemy pockets of the Belhamed height and re-establish the siege ring. This led to a “dramatic exchange of words” between the GOC of the division and General Crüwell of the Afrikakorps at lunch time. In the end however, General Sümmermann got his way partially and obtained a delay of the attack from 1400 hours to 1600 hours. It never took place. At 1500 hours the order to retreat came and the battle outside Tobruk was lost.
Unknown Command Post during the battle for the salient. Rommelsriposte Collection.
15.00 hours General Crüwell passes on order from General Rommel as follows:
The armoured corps retreats west into the area 30km west of el Adem. 90.lei.Div. holds its position and continues to close of Fortress Tobruk from the east and south-east. In this regard the division takes command of the Belhamed and from 19.00 hours Ed Duda. In this regard Gruppe Mickl is subordinated. 21.Pz.Div. takes care of establishing communications Mickl to Sümmermann. In the rear the division will be covered by Mot. Korps Gambarra in the area of Sidi Rezegh. This creates a corridor. Through this corridor, on the night 4 to 5 December, the whole of the artillery of the division will be moved to el Adem. Prime movers will be allocated.
Following receipt of this order the intended attack is no longer considered[…]
22.15 hours a new order from Pz.Gr. that apart from small rear guards also the division will be pulled out of its prior positions. Positions Belhamed, ed Duda, to be held and later to pull pack on El Adem. To the south stands Mot. Korps Gambarra and protects against attacks from the right flank. This order is immediately transmitted to the troops.
Lt. Hollmann became the leader of the rear guards, which consisted of one section per company. These were to hold until dawn, feint occupation of the position, and then in the late morning hours retreat as well.
Underscoring further the deflation of the day is the report by Artillerie Regiment 33, which participated in the second attempt to reach Bardia.
Advance on Sidi Azeiz and Rearward March via el Adem on 4.12.41
On 4.12. 15.Pz.Div. advanced from the area Zaafran on Sidi Azeiz.
Order of march (large units)
Tank battalion Ramsauer
The march was at first disturbed by artillery fire from the south, but from Gasr el Arid went without any noticeable events.At Sidi Azeiz the tanks in the van met weak enemy who retreated immediately. The II. and III./A.R.33 went into firing position immediately and took the fleeing enemy as well as the abandoned leaguer under ricochet fire. An enemy battery returned fire but without major effects.
During the afternoon the rear march commenced, at first into the area of Zaafran. During the night it became known that the enemy had managed to connect with Tobruk. The division united with its supply columns in the area of the junction with the Zaafran track on the Trigh Capuzzo and at 02.00 hours on 5.12. broke through to the west. The artillery marched in the group of 15. Schtz.Brigade. Apart from attacks by enemy bombers no special events.
What had happened was that the advance guard of 15.Pz. had run into 31 Field Regiment of 4 Indian Division, who were in no mood to entertain them. Their diary describes the inconclusive action.
Enemy reported clear of SIDI AZEIZ at first light and our O.P.s felt their way forward, finding no opposition. At mid-day 14 enemy tanks with guns and lorried infantry observed approaching SIDI AZEIZ. Tanks in close formation. C.O. ordered fire to be held which appeared to make the enemy uneasy. No doubt he wanted to confirm where our gun positions were. Tanks appeared to split up and attempt reconnaissance. Some spasmodic shelling. We engaged enemy A/Tk guns observed being toward across skyline and they withdrew. Finally enemy column and tanks withdrew, admitting defeat and apparently with nothing accomplished.
Bologna reported a strength of 3 rifle companies, 1 machine-gun company, and two artillery batteries on this day.
 You can read about how this went at this link.
In this mode rounds would ricochet off the ground, and generate airbursts.
The infantry of the division.