Depends on the scenario.

He's easy to beat, just put ox tethers in front of two of their gate houses. Then get your
troops ,about 20 is all it takes. And pick them off one at a time. I like to use macemen.
They seem to be the tuffest. Put archers in your towers [w/fire]to hold off his spearman.

first you have to build your castle in a fast pace. try to get lookout towers around ur
castle. then try 2 put ox tethers in front of there gate house & put them 2 sleep. that
will make them stuck in their castle & then get 150 horse archers at one castle at a time.
Then send lots of swordsmen. Oh yah if you want to have lots of food you will have to
select an farm and pause then press sleep twice then unpause

instead of thinking how tobeat them make many many archers(the eu ones)then make a castle
make many towers infront ofthe snakes and put the archers onthem as much as you can then
make a huge army of pikemen.itmay take long but it's useful (around 175 of them)then make
an army of arabian horse archer (around 150)after that make them both to attack the horse
archers will kill the archers and the other one (pikemen)will attack the ****** walls and
then kill the lord (AI snake)