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.
If my opponent plays Burned Village at a battle at one of my provinces, is it I or he that is discarding the cards? If I am playing Central Castle, can I draw a card using its reaction?
Burned Village Terrain Battle: Before this battle's resolution, discard all cards in or attached to this battlefield's province.
Central Castle Reaction: After the resolution of an action during battle for which you discarded a card due to its costs or effects: Draw a card.
If my opponent plays Burned Village at a battle at one of my provinces, is it I or he that is discarding the cards? If I am playing Central Castle, can I draw a card using its reaction?
Burned Village Terrain Battle: Before this battle's resolution, discard all cards in or attached to this battlefield's province.
Central Castle Reaction: After the resolution of an action during battle for which you discarded a card due to its costs or effects: Draw a card.
No, you may not react to Burned Village's action with Central Castle.
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The first sentence of Loïc's answer here explains what "discarding" means on Central Castle, and why Burned Village's discarding wouldn't apply.