Battle of Mareth Line, Tunisia, 1943. The Mareth Line was a system of fortifications built by the French between the towns of Medenine and Gab in southern Tunisia. On march 20, Montgomery attacked the line with 30th Corps while making a flanking attack to the south, around the German right flank, with New Zealand and Free French troops. There are five Controlpoints, hold at least four to cause a ticket loss for your enemy.