Probably my favourite display game at GamesDay 2008 was the Dwarf City that was under attack by a sea borne Orc and Goblin army. The scenery was beautifully constructed, some amazing Venetian inspired buildings and bridges.
The Orc boats were wooden attack boats that looked like the Orcs had just thrown them together.
There were many vessels that had landing craft abilities.
In the background of this photo, you can see a Dwarf Monitor steaming out to defend the city from attack. The Orc boat in the foreground has siege engines lashed to the deck.