It's the Sacred Defence Week in Iran, an annual commemoration of the 1980-1988 Iran-Iraq war. It's a very important week as it remembers the strong defence of Iran against Iraq despite its obvious shortcomings in military power and arms. The war lasted for 8 years, starting in 1980 when Saddam Hussein became motivated to take advantage of Iran's recent Islamic Revolution and the chaos that had come with, and attacked without formal warning. However, it made only limited progress into Iran and was quickly repelled; Iran regained virtually all lost territory by June 1982. For the next six years, Iran was on the offensive. Iran lost over 100,000 people in the war and suffered an economic loss of US$627 billion, but it kept its independence and its borders, and Iraq's desire to replace Iran as the dominant Persian Gulf state ultimately failed.