I think your problem, kleemann, is that the animations from Chivalry TW are developed for RTW 1.2.

I tried also adding the crossbowmen animation, and failed , whereas I was able to include RTW 1.5 animations without problems following the tutorial.

My advice is: try to use the tutorial with some well-known and tested 1.5 animations (I would recommend SigniferOne 0.8 or the new EB pack of animations). If you succeed, then the problem is not your skills, but the version of the animation you are trying to include.

Cheers.