El Cid begrudgingly must rescue King Alfonso (blue/Spanish) from the Black Guard Army (cyan/Saracens),Black Guard Navy (yellow/Saracens) and Yusuf (green/Saracens). Though he fights for King Alfonso against the Moors, El Sid has the Saracen technology tree. After establishing himself in King Alfonso's fort to the west, the Cid must destroy all of the Docks that the Black Guard Navy controls in the river to the south. There is also a Mosque towards the west, and if you convert it and leave behind a Monk, you will earn all Monastery technologies for free (except for Redemption, which must be researched to convert the Mosque).