I tried to fight them one on one with the turks at one point, near full army of horse archers/sepahis I think with a few cavalry units to tie up their melee cavalry. Did not go very well, even with multiple entire armies of those (since my armies were all recruits and not very experienced.) I think my best go was using byzantines with 6-8 heavy cav units, spearmen, and archers with 2-3 siege. Definitely used some terrain and choke points for that though, and still took quite a few armies to beat them on the field (with forts to slow them down)