My opinion would be quite helpfull to have propriety colors for trails on the map 

- raid ( ? RED )

- siege ( ? Orange )

- re inforcement ( ? Green ) 

- scouting ( ? Blueu ) 

- return  ( ? Yellow )

and if several actions to same target, first landing as default color ( would help players  to correct sieges arriving before raids  for example) 

When you have several action ongoing, its time consuming to go  through  a long list to find the right target.