How to add a trample attack for dragoons?

Age of Empires III: DE III - Modding
1

Royal dragoons have it.

I swapped royal dragoons protounit lines with the dragoons. Later I tried changing the anim files. Now dragoons use the RD model, but still can’t trample

Maybe my mergemode=“add” is missplaced?

      <name>TrampleHandAttack</name>```
or 
```<protoaction>
      <name mergemode="add">TrampleHandAttack</name>```
???