for effects such as if you lose a battle like Ring of Fire, since kumorus ambush does not kill anyone during resolution if one person has more force than the other is it still considered a win/loss? would attachments be destroyed?
Kumoru's ambush
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.
for effects such as if you lose a battle like Ring of Fire, since kumorus ambush does not kill anyone during resolution if one person has more force than the other is it still considered a win/loss? would attachments be destroyed?
Yes, there is still a winner and loser, and battle resolution will still destroy attachments.
On: Ring of Fire