On this hectic map, your villagers attempt to shepherd home their flocks while avoiding rampaging wild animals. The map is best summed up simply: lots of sheep, lots of wolves, no Scout. In fact, there is very little food of any kind but sheep, and you are going to have to risk your villagers to find them (Hint: get Loom). The land of the map is fairly Continental in topography--it would be too easy if your sheep could always make a straight line for your Town Center, now wouldn't it?
It is not uncommon for players to end up with 25 or more sheep, provided they do a good job of villager scouting. The lack of a starting Scout Cav / Eagle Warrior also has ramificiations--many players are so used to scouting with military units that they have trouble finding enemy towns without them. It is not uncommon to find sheep late in the game outside of someone's town that they just plain missed. Once the initial shepherding phase of the game winds down, the map returns to fairly normal gameplay, provided you can shift your economy from gathering to farming or fishing. There can be a reasonable disparity in Castle times, though, if some players miss out on the sheep bonanza or lose too many villagers to the dingos. Obviously, Britons and Celts love this map.
Thanks to Harter Ryan, Producer of Age of Empires 2, who originally came up with this idea long ago.