As vice chairman of the Revolutionary Command Council, al-Douri was involved in the wars against Iran and Kuwait. During the 1988–1989 Al-Anfal Campaign, al-Douri was said to have ordered Ali Hassan al-Majid (aka 'Chemical Ali') to use Mustard and Sarin nerve gas on Kurdish fighters in Halabja. He was complicit in the invasion of Saudi Arabia and the attack on the town of Khafji in January 1991. During the 1991 uprisings in Iraq, he was involved in the suppression of the revolt led by the Iraqi marsh Arabs. When the Kurds rebelled again in 1991, al-Douri warned them "If you have forgotten Halabja, I would like to remind you that we are ready to repeat the operation."