A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 16 July 2008
This situation happened the other night, a large Oni army from the Maw's Grave came over to try and take out 4 phoenix provinces in one shot. The phoenix player defended against one of the armies leaving the other 3 undefended.
Akuma no Oni XP2 was at province A, an undefended one, that battle resolved first taking out that province and the province the phoenix army defended. What happens to that army?
1) Does the army go home as there is no longer a province to have a battlefield at 2) The army stays at the battlefield as there is an opposing army but it becomes a battlefield not attached to any province
[Mod edit - Thread title: Akuma no Oni instead of Oni no Akuma - LH]
A player, 17 July 2008
Akuma no Oni XP2 was at province A, an undefended one, that battle resolved first taking out that province and the province the phoenix army defended. What happens to that army?
1) All units at the battlefield of the province destroyed by Akuma no Oni (Experienced 2)'s trait's effect return home, and those units on the attacking side bow, per Final steps (emphasis mine): "If a province is destroyed for any reason other than resolution during a battle or attack, its battlefield ceases to exist and any Terrain in play there is discarded. All units still there return home. These units bow if they were in an attacking army or if they were allied units."