Follow the alley until you reach the main street. After the scene, run to cover and engage the cartel pursuers. Clear the path downhill and proceed to the next narrow alley. Follow the alleys until you find an open space. Take out the enemies there then flank the MG mounted behind the technical. Move forth carefully as new enemies will emerge ahead, including a brute.
Continue along the path again until you reach the a small marketplace. Check out the marked stalls then proceed to the forth one. The next area after the three searchable stalls has a lot of enemies, including another brute so be careful. After clearing the area, breach the door to find Cordova. After locating him, proceed forth and breach the iron gate open. Enter the next building to complete the section.