Well my Later Medieval German army attempted to vend off Ikhanid horde and for their pains were defeated.
My plan had been to try and put the Ikhanid in between a rock and hard place. My forces would be too strong for him to attack. However, if his light horse attempted to do the shoot and evade tactic he would risk his light horse being caught in the rear by my light horse and cavalry if they attempted to evade. Well that was the plan anyway.
On my left flank there was a large piece of uneven ground (the battle wagons where next to it). On my right flank (next to where his flank march arrived) was a steep hill.
The short story of how it came unstuck was I allowed my army to become divided and he was able to deal with it piece meal.
The longer story is I shouldn't of left my crossbow to stand up to charge from his knights. His breaking of this battle group, and a battle group of my mercenary knights, smashed open my centre. On my right flank my mounted crossbow went to far ahead in their pursuit of his light horse and found themselves shoot to pieces by his cavalry and light horse. He then finish me off when his flank march came on (his flank march hand two battle groups of cavalry and a battle group of bow). I had expected it, but with battle groups need to fill gaps else where I did not have the forces necessary to deal with it.
Lessons Learned
1) I let my army get split up and paid the price for it.
2) I should levered my deployment around the steep hill on my right flank
3) My crossbowmen should not have been deployed in centre in front of knights.
4) My battle wagons should have been deployed to protect either flank.
5) My pikes, light horse and mounted crossbowmen should have been deployed in front. My knight and lighter men-at-arms (cavalry, armoured with lancers) should have been reserve behind the front line.
6) My light infantry and crossbow could have captured the hill. Alternatively my light foot could have been used to shield a battle group of knights.