I think it´s Arab Combat 2. Personally, I find the "Mobilizes" better than the combat themes, and whereas "Euro Mobilize 2" is one of my overall favorite themes, I admit that Euro Combat themes are far worse than the Arab counterparts (my favorite arab combat theme is that one that starts with an irrintzi, or however you call that kind of scream)

My other favorite, Arab Winter 2 (In my personal musical files renamed to "Al Andalus", once transformed to Mp3), is the slow one with a storm playing underneath. It´s quite themish for muslim factions, once you´ve cut your way into Europe, or are already in it. It´s not hard to imagine Almansur (or, Miramamolin, rather, as he was of the Almohad dinasty caliphs), sitting in a campaign tent under a light north rain, planning his onslaught against London, Paris, or Genoa...