The Second Battle of Fallujah, codenamed Operation al-Fajr (Arabic: الفجر, lit. 'The Dawn') and Operation Phantom Fury, was an American-led offensive of the Iraq War. Marking the highest point of the conflict against the Iraqi insurgency, it was a joint military effort carried out by the United States, the Iraqi Interim Government, and the United Kingdom. Within the city of Fallujah, the coalition was led by the U.S. Marine Corps and U.S. Army, the battle was later described as "some of the heaviest urban combat U.S. military have been involved in since the Battle of Huế City in Vietnam in 1968".