The Insurgency in Iraq began after the 2003 invasion by a coalition led by the United States. Following the fall of Saddam Hussein's regime, various groups opposed the new government and foreign presence, leading to widespread violence and instability. Insurgent groups included al-Qaeda in Iraq and other factions that sought to challenge both the coalition forces and the Iraqi government. The conflict saw numerous attacks, including bombings and ambushes, targeting military personnel and civilians. Over time, the insurgency evolved, with some groups shifting tactics and forming alliances. The situation remained complex, influenced by sectarian divisions and regional dynamics, impacting Iraq's security and governance.