- "...Are you our backup? Wow, that's a pretty small squadron..."
- ― Davis Unit Leader
Pinned Down is a campaign mission in Ace Combat X: Skies of Deception. This mission becomes available if the player completes The Midnight Sun, which removes the threat of the Gleipnir's Shock Wave Ballistic Missiles. The player must defend the Davis Unit from enemy forces.
Eugene Solano: Allied ground forces are stranded at Stand Canyon. They are members of the Davis Unit who were en route to an assault on Santa Elva when they were cut off from the main force. The troops have already been surrounded by enemy forces and are taking heavy fire. There's no time to lose.
With the threat of a long range enemy attack passed, an allied air unit was deployed for rescue, but it doesn't look like the troops can hold out much longer. Try to hold back enemy forces until the rescue unit arrives. I believe it's our duty to protect the Davis Unit.
The goal of the mission is to defend the Davis Unit from all enemy forces. Damage suffered by the Davis Unit is displayed on the Multi-Purpose Gauge; if the gauge is filled up, the mission will end in failure. The mission will be completed if eight minutes pass.
At first, the main threat to the Davis unit is from tanks and AH-64s. Several bridges can be destroyed to keep the enemy tanks away from Davis. Not all the AH-64s are present on the map at start, so the player should watch out for any helicopters that might have escaped notice.
Once three minutes pass, MiG-21-93s, F-16XLs and later Tornado F3s appear and start harassing the player, while A-10s spawning in the southwest attack the Davis Unit. Enemy aircraft will continue to spawn for the rest of the mission, and more tanks will also appear.
To complete it with an S rank, the mission must be completed with the Davis Unit having suffered no damage from enemy attacks, and with a large number of all enemy forces destroyed before Aurelian reinforcements arrive. The player should promptly remove tanks and AH-64s during the first part of the mission, then focus on fending off A-10s.
Eugene Solano: It appears that a rescue unit has successfully extract the stranded Davis Unit. Although the unit has suffered terrible losses, thankfully they've been saved from complete annihilation. Several aircraft parts have been discovered in the ruins of the enemy base. Head over to the hangar when you've got a chance.
- When the northwestern bridge is destroyed, one tank will still try to cross it, subsequently falling to the ground and crashing.