Engage: You have the first opportunity in this battle to pass or take a Battle action, which must come from a card in a unit.
Does this have to happen in the province that the event is in or can it be used for any province?
Into the Wastes
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.
Engage: You have the first opportunity in this battle to pass or take a Battle action, which must come from a card in a unit.
Does this have to happen in the province that the event is in or can it be used for any province?
Events are neither cards in units nor Fortifications, and so are not subject to the first part of the Rule of Location.
On: Into the Wastes