Iran was still dealing with the internal conflicts occurring after the Islamic Revolution when Saddam attacked Iran on Sep 22, 1980. The Iraqi forces advanced up to 80 Km inside Iran in six days. Saddam wanted to annex Iranian province of Khuzestan to Iraq and for this end, he needed to conquer the major cities of Abadan, Khorramshahr, and Ahvaz. They had reached the gate of Khorramshahr in 5 days; it was a large city, crowded and oil-rich. But the popular resistance and every single individual stopped the Iraqi war machine for 34 days. The resistance of people in Khoramshahr caused Iraq fail to occupy Ahvaz and Abadan; however, the capture of Khoramshahr meant a significant victory for Saddam and he began to raise the negotiation so to force Iran to concede to their demands. Although Iran's operations had all failed at the beginning of the war, the ceasefire was turned down as it meant to be losing Khorramshahr. Iran's successive failures made the military commanders change the war management extensively. In less than two years, Iran's victories began and ultimately Operation Beit ol-Moqaddas was launched. This operation was one of the largest and at the same time the most complex war operations in the 20th century which led to the liberation of Khorramshahr. It happened while Iraq had built the firmest defense in Khorramshahr. The liberation of Khorramshahr was a turning point in the war at which the world was surprised. The Iranians are still celebrating the victory. The victory was achieved as a result of the cooperation of the Army and Sepah (Islamic Revolutionary Guardian Corps). The Army's commander was Sayyad Shirazi. In the book "City of Blood," Martyr Sayyad narrates this operation from the view of the highest level of commandership in Iranian forces. He explains the various strategies, tactics, and tricks of Iran's Army and Sepah for skirting, surrounding, and attacking the Iraqi forces, and the most interesting one is his explanation of the conditions when Iranians could not advance and lost all their power. In such a condition, through the ingenuity of their commander, they enter the city with a few soldiers. Being helpless, the Iraqis surrendered upon seeing Iranian forces. Around 14500 Iraqis were taken captives in the city. The Iranians were not even ready for moving such a large number of POWs. That was the reason they made the Iraqis form a queue to walk to Ahvaz, a 165-km route. It was in the morning that the captives had moved and in the afternoon they all left the city. This book is based on an interview after the end of the war and a few years before the General’s assassination by the MEK (People's Mojahedin Organization of Iran).