This scenario is a blood map.
You get upgrades as you get kills and you also get other things for razings. You also get reinforcements as you go along.
The aim is to destroy your enemys tower so that they will recieve no more units.
There are some extra things you can do aswell. There is a buying zone. Each time you get an upgrade you get a sheep in the buy zone. You save up your sheep and you can buy extra units.
The host can also start a sheep race. This is where each player gets a sheep and they must get past all sorts of things to get to the end. The winner gets 2 sheep to buy stuff with.
There is not much added in version 1i. Its mainly just better terrain. To see all the stuff added look in the scouts section.