killed and subsequently mutilated by insurgents and a crowd of residents in the city of Fallujah, long a particularly troublesome center of Sunni resistance to the U.S. presence. On the same day, 5 U.S. soldiers were killed by a large IED on a road a few miles outside of the city. The attacks took place as the Marines were taking over responsibility for Al Anbar Governorate, in which Fallujah is located, from the U.S. Army. The intended Marine strategy of patrols, less aggressive raids, humanitarian aid, and close cooperation with local leaders was quickly suspended and the U.S. decided that it was time for a major assault to clear the city of insurgents. On April 4, U.S. and Iraqi forces launched Operation Vigilant Resolve to retake the city, which had clearly fallen completely into rebel hands. They met very stiff and well-organized resistance from the guerrillas. The insurgent force defending Fallujah was believed to number over 2,000 men, divided into platoon-sized units. The guerrillas used sophisticated tactics not seen before in the Iraq war, using standard infantry tactics such as indirect fire support, cover fire, and phased withdrawal. It was noted to resemble a Soviet-style "defense-in-depth" strategy, suggesting guidance from former members of the Iraqi Army rather than foreign jihadis who would more likely used tactics reminiscent of the mujahideen in Afghanistan. After three days of fighting with the U.S. Marines, the insurgents still held three-quarters of the city. Cases of widespread reach and planning, suggesting national insurgent coordination, were noted. Hundreds of insurgents cut the road between Fallujah and Baghdad to the east, while west of Fallujah in Ramadi, over 150 insurgents launched an offensive against U.S. Marine positions. A similar attack followed, conducted by about 150 insurgents, against U.S. Marines near the Syrian border in Al-Qa'im. The assaults were beaten back, but the U.S. toll from the combined attacks numbered in the dozens. Political pressure began to build on the United States and the Governing Council of Iraq as the hospital of Fallujah continued to report high numbers of civilian casualties, inflaming further the Iraqi people and Muslim world in general. After two weeks of fighting, the U.S. Marines were on the verge of capturing, but had not yet taken central control of, the city of Fallujah. Pentagon leaders, fearing that continuing the effort to capture the city might further inflame a larger revolt against coalition authority, pulled