The Great Gatehouse of Albion is guarded by the Draconem River. Anyone wishing to cross the river must travel between two linked watchtowers (Castor and Pollux) and over Greffen Bridge.
This creation was made as an extension to the Great Gatehouse of Albion for BrickWorld 2012. See below for a photo of the gathouse itself. The bridge and gatehouse combo was one of the smallest castle creations at Brickworld, but it probably also packed in more details per brick than the cool, enourmous builds others brought.
The soldiers aren't marching to their water doom... the end of the bridge is right where the drawbridge from the gatehouse comes down.
And here is the gatehouse it links to. The gatehouse is already up here on MOCpages, so check it out as well.
I hope to add a picture of the two parts together when I dig out my camera from BrickWorld.