Route
There are two routes through this map. There is no significant difference between them. Chose if you are manually clicking, the lower route is going to be slightly less mouse movement.
Option 1: Move your Echelon up two nodes, then to the left one node.
Option 2: Move your Echelon down one node, to the right one node, and down one node.
In either case, you can add an additional click with planning mode allowing the mission to auto-complete.