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, 22 August 2007
Wedge - "Battle: Target one of your Personalities. You can not target cards in his unit with actions until after this battle ends. After this battle’s Resolution Segment begins, double his Force and the Force of each Follower in his unit. Destroy him after the battle ends."
Ordered Retreat - "Battle: Move home one or more target Personalities in your army. You may straighten a number of your units up to the number of Personalities you moved home."
Can I use the effect from Ordered Retreat to unbow a bowed personality that was previously targeted with Wedge?
Martin Lund (rules official), 22 August 2007
Wedge - "Battle: Target one of your Personalities. You can not target cards in his unit with actions until after this battle ends. After this battle’s Resolution Segment begins, double his Force and the Force of each Follower in his unit. Destroy him after the battle ends."
Ordered Retreat - "Battle: Move home one or more target Personalities in your army. You may straighten a number of your units up to the number of Personalities you moved home."
Can I use the effect from Ordered Retreat to unbow a bowed personality that was previously targeted with Wedge?
Yes, assuming you sent someone home. The send-home targets. The straightening effect does not tell you to target anyone.