Further combat was seen during 2003 when US forces invaded Iraq and deposed the Iraqi leader Saddam Hussein, in an invasion that lasted just 43 days (20 March to 1 May). M1 tanks proved instrumental in leading rapid attacks against the Iraqi military, as exemplified by the so-called 'Thunder Runs.' As of March 2005, approximately 80 Abrams tanks shipped back to the United States for repair due to fire from enemy attacks. Abandoned Abrams were purposely destroyed by friendly fire to prevent recovery of vehicle or technology. Damages by 25 mm AP-DU, anti-armor RPG fire, and 12.7 mm rounds was encountered. There were no confirmed instances of anti-tank guided weapons or anti-tank mines striking the US MBTs. However, there is some speculation that Kornet ATGMs were used during the Battle of Najaf to knock out two Abrams, but Russian officials denied selling the weapon to Iraq. What is known is that the two Abrams were struck by unknown weapons, and their ammunition stores ignited. Nevertheless, both crews escaped without serious injury. Some Abrams were disabled by Iraqi infantrymen in ambushes employing short-range antitank rockets, such as the RPG-7. Although the RPG-7 is unable to penetrate the front and sides, the rear and top are vulnerable to this weapon. Frequently the rockets were fired at the tank tracks.