The operation had some initial success but the effect that the Americans wanted to achieve did not happen. Very soon the American forces were bogged down in heavy street fighting throughout the city. Insurgents launched hit and run attacks on the newly established outposts, which were sometimes assaulted by as many as 100 insurgents at a time. In a major battle on July 24, Al-Qaeda and Saddam Loyalist forces sustained heavy casualties when they launched complexed attacks on every American outpost throughout the city.