Escalation is a multiplayer map.
It is the courtyard at the front of the Fenix Manor in singleplayer mode. The Map spawns the teams at both ends of the map. One team at the front of the Manor and the other at the bottom of the courtyard. The team at the bottom has access to two Longshot. The team that starts at the manor has less powerfull weapons. A revolver and the locust standerd weapon. Also another pair of grenades can be found on the first landing. Also another standard locust weapon can be found on the second landing.
The team that starts at the manor is at a slight disadvantage, a plan of attack is to quickly rush the down the right and left stairs, two left two right. Flanking is huge in this map. Also because many cover spots have a tiny "opening" ypu can be shot downwhen enemies are right in front of you, so pick your spots with caution.
Starting at the bottom of the courtyard players should get the two Longshot and the frags. Then rush to the top looking for to flank. One or two of the team should stay back with the Longshot. The trick to success is to attack the other team at their sides.