Is it this one: Spin mouse wheel or use the R or F keys?
More keys can be found back in the manual. Pages are colored so one easily overlooks the list.
This trick takes you to 1st person view of that troop.
You can tell him to run across the map and you are right there with him. Running downstairs through gate houses over bridges.
I know it is possible I used to tell people about it all the time, I have not played Legends in almost 2 years and I have forgotten.
I used to do it with dragons to get a fly over of map.