The plan began with a major operation to secure Baghdad, codenamed Operation Fardh al-Qanoon (Operation Imposing Law), which was launched in February 2007. However, only in mid-June 2007, with the full deployment of the 28,000 additional US troops, could major counter-insurgency efforts get fully under way. Operation Phantom Thunder was launched throughout Iraq on June 16, with a number of subordinate operations targeting insurgents in Diyala and Al Anbar Governorates and the southern Baghdad Belts.[55][56] The additional surge troops also participated in Operation Phantom Strike and Operation Phantom Phoenix, named after the III "Phantom" Corps which was the major US unit in Iraq throughout 2007.