This one is still a work in progress, but this is what I've got:
Burrow Raids are very similar to invadin other territories, but the attacking group doesn't always battle with the other group. The attackers will attack the burrow, rather than the main group, and any pups and babysitters inside. If they is a babysitter inside the burrow, you have to battle the babysitter first, before you can attack the pups. If there is no babysitter, lucky you! You can go straight for the pups. But you can't post something like "Juamba enters the Willows burrow and kills the pups", you have to have a few posts before that before you can attack the pups. So these are the basic rules:
1. Minimum of two posts before you attack the pups.
2. Only the DF can kill the pups.
And that sums up a burrow raid.