this guide uses 3 MoDs as blockers, the placements of which are not my own work but taken from our friends at http://settlersonlinemaps.com/
The only thing I have done here is to modify the guide there to accomodate whatever your choice of Champion was in the Christmas event. And I know this adventure can be done with just 28R losses, but I'm not concerned with that; my version allows for us to place the gens once and then send all gens to their relevant attacks in one hit.
Hope you enjoy it