Bug with moving units into earthworks

[asmallcat]

Playing as Union, whenever I try and move a unit into an earthworks fortification (by clicking and dragging the move arrow until the shield is highlighted and the blue dots showing where the unit will go in the earthwork appears), the unit never actually moves into the earthwork and instead just sort of moves to a random position and direction near the earthwork.

Am I doing something wrong? How on earth am I supposed to move units into earthworks? 

[The Soldier]

Select the unit and right-click the shield icon.

[asmallcat]

11 minutes ago, The Soldier said:

Select the unit and right-click the shield icon.

Oh my god.

Thank you lol. 

[A. P. Hill]

It's the little things!