Mission 23: Infiltration of the Cult Leader's Base

Infiltration of the Cult Leader's Base is the twenty-third mission of Halo: Spartan Assault.

Introduction
Merg Vol's base on the moon was surrounded by Tyrant anti-aircraft turrets. Hearing of Spartan Palmer's theft of Parg Vol's ship, Merg Vol ordered every flying craft to be shot down, the only exception being commanding officers' Phantoms.

Having successfully piloted the Phantom through the Covenant fleet orbiting Draetheus V's moon, Palmer was able to land south of Merg Vol's camp, out of range of his turrets. Her Trojan Horse tactic had worked. Although she was closing in on Merg Vol, she still had to fight her way through a heavily fortified camp of his most seasoned soldiers. If only she could persuade them to leave the safety of their positions.

Eliminate all enemies
Spartan Sarah Palmer exits Parg Vol's Phantom gunboat. Nearby, a Kig-Yar Minor is patrolling. Palmer eliminates him, alerting several other Kig-Yar nearby. North, a Sangheili Minor leads a lance of Unggoy Ultras. Palmer encounters them and, after a brief firefight, she manages to kill them all. Nearby is the base of one of the Tyrant anti-aircraft turrets. Several Sangheili and Kig-Yar Minors exit it and join the fight. As the Spartan continues to battle the Covenant soldiers coming from within the Tyrant, Kig-Yar, Unggoy, and Sangheili forces enter the fray from all directions. Meanwhile, a Jiralhanae Chieftain enters the area from the far west and upon seeing the Spartan, charges at Palmer. Shortly after the Brute Chieftain's arrival, a Stealth Sangheili stalks Palmer and attacks her when she nears.

Spartan Palmer is eventually successful in eliminating the Sangheili and Jiralhanae Chieftain. While more Kig-Yar and Unggoy—including suicidal Unggoy Minors—enter the battle, several Sangheili Majors exit the Tyrant's base and attack the Spartan. After Palmer is successful in killing dozens of Kig-Yar, Sangheili, and Unggoy forces, a second Jiralhanae Chieftain exits the Tyrant and charges at Palmer. Eventually, she manages to kill him. From the north, a third Jiralhanae Chieftain enters the Tyrant's clearing and attacks. However, Palmer is successful in killing him too. With the Chieftain dead, all Covenant forces in the area have been eliminated.