The coalition's advance was much swifter than US generals had expected. On 26 February, Iraqi troops began retreating from Kuwait, after they had set 737 of its oil wells on fire. A long convoy of retreating Iraqi troops formed along the main Iraq–Kuwait highway. Although they were retreating, this convoy was bombed so extensively by coalition air forces that it came to be known as the Highway of Death. Thousands of Iraqi troops were killed. American, British, and French forces continued to pursue retreating Iraqi forces over the border and back into Iraq, eventually moving to within 240 km (150 mi) of Baghdad, before withdrawing back to Iraq's border with Kuwait and Saudi Arabia.