Terrain benefits

[Compass Rose]

If I am reading your picture correctly, it looks like your embankment is located in the hexes with the road/path.

If this is correct, your best defensive position against ground troops would be in those road hexes, which are on top of the embankment.

That way whenever the enemy shows up, you'll be firing down on them and if the enemy wants to control that position, they will have to attack uphill.

I am sure someone who knows this series backwards and forwards will tell you about the calculations that are used for such a position.