The battle for the outposts at Tobruk, from 12 October 1941

Sunrise on 12 October 1941 showed some 19 German tanks and about six vehicles facing the 2/17th Battalion area. Perhaps most were near Plonk, which the Germans had reoccupied since it had been left vacant. The Australians could discern a line of sangars on both sides of Plonk. Workers could be seen during the day extending this new defensive line. The enemy had setup wire around Plonk by mid-morning on the 12th. Later in the afternoon showed that the enemy had laid more wire from Plonk out to the sangar line.
After these developments, the decision was made to provide tanks for Cooma for the night hours. They would drive through the perimeter at dusk and return there by dawn. During the day, troops of infantry tanks would be kept available to drive to Cooma, if needed. The 4th RTR initially provided these tanks, and then for two days, the 7th RTR provided the tanks.
In the evening, the Australians could see enemy tanks near Plonk and Cooma. Several tanks drove near the perimeter wire. The Australians sent out "tank hunting patrols", but they did not make contact with the enemy. The scheduled British tank presence set out at 1am. They did not see any enemy tanks, but they fired on the enemy working parties. The enemy had about twenty anti-tank guns set up and they fired at the British tanks. To the Australians within the Tobruk perimeter, there seemed to be a tank battle happening, but it was just the anti-tank gun fire and the tanks shooting. The Australians moved back into the Cooma outpost and went to work on strengthening the defensive positions.
After the last battle over Plonk, the enemy was content to work on extending their defenses. The Australians continued to occupy Cooma and the arrangements for tanks were continued while the Australians were still in the southern sector. Their remaining time was limited, because they were to be withdrawn while more units were carried in to replace them. The enemy now had some 100 guns available. The largest were the 210mm howitzers, one battery of 149/35 guns, and another battery thought to be 155mm. The enemy was thought to have 10 field batteries, 12 medium batteries. and the three heavy batteries. The enemy strength in the south was so dominating that the options for raiding at night were greatly reduced. In other sectors, the Australians were still strong enough to carry out aggressive patrolling. This is based on the account in Vol.III of the Australian Official History.