Context : However, on one occasion, in August 2006, during the post-invasion stage of the Iraq War 2003 an RPG-29 was fired at a Challenger 2 that was climbing over a ramp, the front underside hull armour of the tank which was not augmented with an explosive reactive armour package was damaged, the tank subsequently returned to base under its own power and was quickly repaired and back on duty the following day. 
Question : What war or battle involved Challenger 2?
Iraq War