on 12 May, Paulus wrote that sea communications between Italy and Libya should be reinforced, that any air and anti-aircraft units sent to Libya should be German and that the army in Libya needed ammunition, fuel and food first, then more vehicles before the dispatch of more men, of whom medium artillery and anti-tank gun crews should have priority. The Tobruk garrison settled into a routine of patrols, air raids and minor attacks, some to regain positions in the Medauar salient and some in connexion with WDF operations. Twin Pimples raid The Twin Pimples was a defensive strong point outside Tobruk, on two hills close together which overlooked the Tobruk perimeter. It was held by the Italian Army, and the 18th King Edward's Own Cavalry (normally part of the 3rd Indian Motor Brigade) held the perimeter opposite. No. 8 Commando was selected to carry out an attack on the Twin Pimples, which conducted patrols for several days with the Indians, to reconnoitre the ground. The 18th Cavalry Regiment was to mount a diversion, while of No. 8 Commando and some Australian Engineers crossed the Italian forward positions and a supply road, to attack the Twin Pimples from behind. The Commandos advanced at on the night of and crossed the Italian lines undetected. At the supply road they took cover, waited until and edged forward just before the diversion by the 18th Cavalry. The diversion attracted Italian machine-gun fire and very lights, as the Commandos got within of the Twin Pimples before challenge, at which the commandos attacked. The password Jock was used when a position had been taken and the Italians were swiftly overcome. The Australian engineers planted explosives on several mortars and an ammunition dump. The plan assumed that it would take for Italian artillery to open fire on the captured trenches, and the raiders were only about away when shelling began to come down onto the position they had just departed. Relief operations Operation Brevity Operation Brevity was a limited offensive to inflict attrition on the Axis forces and to secure positions for a general offensive towards Tobruk. The Allies attacked with a small tank-infantry force in three columns and seized the top of the Halfaya Pass, Bir Wair and Musaid, then pressed on and took Fort Capuzzo. The coast group failed to capture the bottom of the Halfaya Pass. The garrison on the east side of the