51st (H) Division then took part in the pursuit to El Agheila and Tripoli in January 1943. By 25 February it was past Medenine in Tunisia and facing the Mareth Line. The Axis force made a spoiling attack on 6 March (the Battle of Medenine) but there was plenty of warning. 51st (H) Division was positioned along the Wadi Zassar, a natural anti-tank ditch, and the A/T guns had been positioned to 'kill tanks' rather than protect the infantry from them. The Axis advance was easily repulsed.