Operation Fajr al-Nasr (Before the Dawn/Dawn of Victory), launched on 6 February 1983, and it saw the Iranian shift of focus from the southern to the central and northern sectors. Iran, using 200,000 "last reserve" Revolutionary Guard troops, attacked along a 40 kilometres (25 mi) stretch near Al Amarah, Iraq about 200 kilometres (120 mi) southeast of Baghdad. One armoured division proceeded to Sumar in the central zone as a diversion to mask seven reserve infantry divisions that went from the southern sector to the central city of Dezful. The Iraqis knew about this concentration of forces and knew that an inevitable mass human wave assault would occur in the central zone, yet did nothing to disrupt what would be Operation Before the Dawn, which began in February 1983.This was Iran's long-awaited plan to take the war inside Iraq on a grand scale. The Iranians wanted to penetrate and capture the cities of al-Shabeeb and al-Amarah, and to reach the highways linking Baghdad down to Amarah and further down to Basra. In the south, a massive Iranian force of two infantry and two armoured divisions, three border guard regiments, an airborne regiment, a Basij division, and two artillery battalions attempted to isolate Basra from the rest of Iraq.[64