The next Axis defence line was along Wadi Akarit. The barrage for 51st (H) Division's assault began at 04.15 on 6 April, and the division's attack, in the words of the "Official History", 'went like clockwork'. 61st (WH) Anti-Tank Rgt went into action with its 6-pdrs towed by tanks while the gun crews rode on the back of the tanks with their ammunition. The tanks then formed a protective screen while the A/T gunners dug in under shellfire. For the first time the regiment encountered Tiger tanks, but these remained out of range of the 6-pdrs using their longer range guns to shell the Highlanders. Axis troops then began counter-attacks and the Highlanders had to fight hard to hold their gains. Some A/T guns got through to support 7th Battalion Argyll and Sutherland Highlanders (A&amp;SH), but not to 7th Bn Black Watch, who were isolated away. However, the positions were held. The pursuit was resumed the following day, through Sfax. From 22 April the division was in action in the hills around Enfidaville, until the end of the campaign on 15 May.