R'as al Ghul when you withdraw units for reenforcements during a battle, the withdrawn unit will not show up on the after battle summary screen. However, if you have installed the patch you should be able to access the logfiles for that battle. To look at the logfiles:
Click on my computer from your desk top

Click on C drive (hard drive)

Click on program files

Click on MTW folder

Click on logfiles

All your battles will be listed by date, time, SP or MP etc.
you'll find each unit listed from that army with kills, honor etc...