A new Rezzed 2014 trailer shows off Stronghold Crusader 2, Firefly's upcoming besieged RTS sequel. The clip shows off the game and reveals it includes a skirmish mode, and this blog post fills in details on how this will operate. Here's a bit:

This includes eight AI characters and the ability to take your castle siege online, which extends to eight players and the option to play in teams or co-op. It simply wouldn’t be a Crusader game without a skirmish mode and the kind of replayability that offers. This is what we intended to deliver from day one and it’s fundamental to the game’s design. Skirmish mode will be included in the game at launch alongside two single player campaigns, one from each side of the conflict between the invading Crusader hordes and Arabic freedom fighters.