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, 18 March 2011
Akodo A attacks province P1, Akodo B (tactician) attacks province P2. Hiruma A defends at province P1. No units at province P3 and P4.
First resolving province P2. Battle resolves and Akodo B returns home and bows. Next declaring battle at province P3. Can i play Countermove and target Akodo B and Hiruma A to move Hiruma A into defending army at current battlefield, (Akodo B stays at home) and straighten both units?
Countermove
Tactical Battle: Target your Tactician who is not at the current battlefield: Target one of the enemy leader's Personalities who is not at the current battlefield. Move both targets to the current battlefield. Straighten their units.
Zen Faulkes (rules official), 18 March 2011
Akodo A attacks province P1, Akodo B (tactician) attacks province P2. Hiruma A defends at province P1. No units at province P3 and P4.
First resolving province P2. Battle resolves and Akodo B returns home and bows. Next declaring battle at province P3. Can i play Countermove and target Akodo B and Hiruma A to move Hiruma A into defending army at current battlefield, (Akodo B stays at home) and straighten both units?
Yes, due to the Blind Cards Rule (see http://rules.l5r.com/CE_Battles#Rule_of_Presence) and that effects are independent