There are four commanders in total: Commander Mosek, Commander Yamji, Commander Lohgor, and Commander Giturh. Follow the quest markers across the Alkali Pan to their locations. Be wary of Desert Wurms as you wander this area, unlike in previous areas, two of them may show up at the same time. The commanders will turn friendly once you've managed to reduce their health to about 20% and the quest will update. Any remaining Awakened forces with that commander will also turn friendly, so it is possible to finish the fight quickly by just focusing damage on the commander.