The regiment returned to the line on 4 June with Honies and Grants taken over from the 4th Queen's Own Hussars; 14 tanks each in G and H Squadrons, 4 in the regimental HQ and 12 Grants in F Squadron. The next day it participated in a failed attack at Bir el Aslagh in the 'Cauldron', a German salient behind the original British and Commonwealth lines. It then retired east to Knightsbridge where, on 6 June, the command tank was hit, killing Birley and the regiment's adjutant. The regiment was by this stage down to a strength of 17 Honies and two Grants, and for the next two days, with Trevor once again in command, it acted as a patrol squadron for 22nd Armoured Brigade. On 10 June, H Squadron was attached to the 7th Motor Brigade (the former Support Group) fighting around Bir Hacheim. It remained with that brigade until the end of the month, while the remainder of the regiment was withdrawn from the line. In addition to the losses in materiel, the Battle of Gazala had cost the regiment 82 casualties, and on 12 June another was added to the list when Trevor was killed in an airstrike. Over the next few days the remaining senior officers appealed to brigade, division and corps commanders to prevent the regiment from being split up and used as replacements.