Until the 2/12th Field Regiment arrived by sea at Tobruk, all the supporting artillery was British. The 2/12th Field Regiment was provided with a variety of guns, all that was available. They operated under the command of the 51st Field Regiment, which was one of the key artillery units at Tobruk. The 2/12th Field Regiment inherited a troop of 60 pounder guns (5 inch guns). The 60 pounders had the issue that they only had a meager supply of ammunition, although more was eventually found for them. They also had two troops equipped with ten 4.5in howitzers that had been made available when the 51st Field Regiment had received 25 pounders. These troops were apparently armed with five 4.5in howitzers each. Perhaps the 60 pounder troop had five guns, as well. The 2/12th lost its first man on 20 May when they were shelled by enemy guns.
One positive action on 29 May 1941 occurred when a 60 pounder gun fired on enemy guns and "neutralized" them with ten rounds. They had to be careful with the limited 60 pounder ammunition supply. Initially, the 2/12th Field Regiment lacked some of the usual amenities that field regiments usually had: "flash spotting and sound ranging". They also needed some air reconnaissance to provide intelligence about the enemy artillery units. The salient area was a problem due to the enemy occupying the best ground for observation. The British and Australian artillery observation posts were at a lower level than the enemy observation posts, so the artillery were hampered in their operations. On occasion, they were able to achieve some success with "predicted fire". Usually, they were reduced to firing to harass the enemy and were able to fire on targets of opportunity.
Wooten's 18th Brigade had been in the salient until 5 June. After that date, Brigadier Murray's 20th Brigade moved into the salient. They had not been able to make any big attacks. They did continue to make adjustments to the lines, however. Back on 18 May, moves were made to close up the distance between Post S8 and the rightmost battalion. The battalions effected were the 2/9th, the 2/10th, the 2/12th, and 2/13th. The 2/13th Battalion was planned to move the center company forward some 300 yards. Some movement happened on 27 May, but the men were forced to retire to their previous position at daylight. The enemy were suspicious of what might be happening and dropped some 650 shells on the western side. Also on the 27th, the 18th Indian Cavalry Regiment sent out a patrol with 2inch mortars and some 18 pounder guns. They drew artillery fire from four batteries and the patrol commander was killed.
Two Australian battalion headquarters moved further west. The 18th Brigade headquarters moved the next day. As the 2/13th Battalion center company moved back to their planned positions, they were attacked by some 200 German soldiers. The Germans were actually ambushed, as they had expected to find the positions empty. The Australians fought with mortars and Bren guns. The Germans withdrew and were chased by some Australians who used grenades and Bren guns to good effect. This is based on the account in Vol.III of the Australian Official History.