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 Longshots. The team that starts at the manor has less powerfull weapons. A revolver and a Hammerburst. A pair of grenades can be found on the first landing while another Hammerburst 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, a group of two players on each side. Many of the cover spots have tiny holes you can be shoot from between when enemies are right in front of you, so pick your spots with caution.
When in doubt, flank.
Starting at the bottom of the courtyard players should get the two Longshot and the Frag Grenades, then rush to the top while trying to flank your enemy. One or two of your teams members should stay back with the Longshot(s). The trick to success is to attack the other team at from their side, across the map.