The Viking leaders offer a distinct advantage in that they can pick up and drop troops off as they move and can perform something akin to an overrun if they can whack all the defending locals in one round of combat. I forget which Viking leader begins the game, but Dennis gets one to start and draws others from a deck of cards each turn.
The Republicans were on the other side of a great gully with cliff-like sides that ran the width of the board. The good news was that it basically formed a firepower-proof covered highway. The bad news was that it channeled attacks to the limited egress spots. The situation unhinged the British commander, who filtered squads through the gully and into nearby buildings.