Passage: On 17 June, using the headquarters of the British 6th Infantry Division, the headquarters of the WDF (Lieutenant-General O'Connor) was formed to control all troops facing the Italians in Cyrenaica, a force of about 10,000 men, with aircraft, tanks and guns. O'Connor was to organise aggressive patrolling along the frontier and set out to dominate no-man's land by creating "jock columns", mobile combined-arms formations based on units of 7th Armoured Division. These small, well-trained, regular forces made the first attacks on Italian convoys and fortified positions across the border. British patrols closed up to the frontier wire on 11 June, with orders to dominate the area, harass the garrisons of the frontier forts and set ambushes along the Via Balbia and inland tracks.Some Italian troops were unaware that war had been declared and seventy were captured on the track to Sidi Omar. Patrols ranged north to the coast road between Bardia and Tobruk, west to Bir el Gubi and south to Giarabub. Within a week, the 11th Hussars (Prince Albert's Own) had seized Fort Capuzzo and at an ambush east of Bardia, captured the 10th Army Engineer-in-Chief, Brigadier General Romolo La Strucci. Italian reinforcements arrived at the frontier, began to conduct reconnaissance patrols, improved the frontier defences and recaptured Fort Capuzzo. On 13 August, the British raids were stopped to conserve the serviceability of vehicles; the 7th Support Group took over to observe the wire for 97 kilometres (60 mi) from Sollum to Fort Maddalena, ready to fight delaying actions if the Italians invaded Egypt.

Question: What nationality helped fortify the front lines of the frontier?
Italian