 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.