I have cobbled together a newbies guide to setting up. Both sides nominate a season. Compare the scores, the higher is the invader. If there is a draw, reroll until there is a winner, noting all die numbers 5.
Battle takes place in invader's nominated season.
The battle takes place in the defender's terrain. The total sum of all dice rolled is the hours after midnight. Dawn applies during hour before sunrise, dusk applies the hour after sunset. Defender nominates which side of the table is North. Defender positions terrain, including fortified BUAs.