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, 4 August 2007
If I ambush somebody and they then send me home, can i move that same personality back into the battle? As ambush states no OTHER units may move there, it doesn't say the assigned personality cannot move back...
cards: Ambush Limited: Target one of your unbowed Personalities: Create a battlefield (not at any province). Assign your Personality to attack there. Assign another player’s target Personality to defend there, even if bowed. No other units may move there. Fight a battle there. After it ends, lose 5 Honor.
Ring of Water Water After you successfully resolve your fourth or later Battle action from cards with different titles in one battle: you may put this card into play from your hand. Battle: Bow this card or discard it from your hand: Move one of your target units home or to a battlefield with one or more enemy units. If the unit moved, straighten it.
Chris Fuchs (rules official), 4 August 2007
If I ambush somebody and they then send me home, can i move that same personality back into the battle? As ambush states no OTHER units may move there, it doesn't say the assigned personality cannot move back...
cards: Ambush Limited: Target one of your unbowed Personalities: Create a battlefield (not at any province). Assign your Personality to attack there. Assign another player’s target Personality to defend there, even if bowed. No other units may move there. Fight a battle there. After it ends, lose 5 Honor.
Ring of Water Water After you successfully resolve your fourth or later Battle action from cards with different titles in one battle: you may put this card into play from your hand. Battle: Bow this card or discard it from your hand: Move one of your target units home or to a battlefield with one or more enemy units. If the unit moved, straighten it.
Yes, you can move your personality back in.