Quote Originally Posted by English assassin
For the first time ever I've kept a game going long enough to actually get some SAP. Now I had always read here that these were some serious infantry.

This coincided with the big orange empire deciding to pick a fight with me. Whenever this has happened in the past I have always found AUM to be pretty much indestructable, but now, surely, I would be the master, right?

Wrong. Admittedly I was giving away three command stars to the Almo general (they seem to have about 200 6 star generals) but it was the same story as before. Even with AUM pinned in front of one unit of SAP, and charged in the rear by another, they took an awfully long time to die. (Die they did, but not before wiping out an entire unit of pikes)

Whats going on here? Are they the best infantry unit or what? I am playing as the Russians so I don't even have much decent cav to run them down with though a boyar sandwich would probably give them pause for thought.
No, vanilla AUMs are mostly harmless to SAP (note the two qualifiers, vanilla and mostly). Stats on AUMs from FBE's guide.

"Almohad urban militia.
Charge 3 Attack 3 Defence 3 Armour 4 Speed 6, 10, 11 Morale 2 Cost 200 Support cost 37

Almohad urban militia are very similar to the Catholic feudal men at arms. They have a shield and a sword, just like the men at arms and they have the same number of men in each unit (80). As far as use goes they should be used like men at arms; put them in two ranks and on engage at will before marching them at some spears or other infantry and letting them charge into battle. Almohad urban militia don’t really need to flank so you can use them to hold a good front line against infantry attacks. You should always endeavour to keep them far away from cavalry or they will die very quickly. If you have no choice but to fight cavalry with this unit put them in three or four ranks, try to find some trees to put the cavalry at a disadvantage and mob the cavalry with as many units as possible. This is an extremely solid unit and is a steal for its price. The militia’s shield only has a 0.5 modifer."

They are slightly weaker than CMAAs. However, valour and wep/arm upgrades would make it different case. Take a look at how many little flags the unit is flying. Chances are, they do have wep upgrades from the iberian provinces.