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, 26 April 2011
I imagine that the reason I can't find this answer in the search function is because it is obvious to everyone but me.
Does a battle action taken off a stronghold count towards putting Ring of Water into play?
I ask because of this quote: Effects, costs, and targeting applied to "cards," or referring to a particular keyword that a Stronghold has, do not legally apply to a Stronghold unless they specifically mention the word "Stronghold," or come from the Stronghold itself.
From this thread: viewtopic.php?f=59&t=77506&p=1016488&hilit=stronghold#p1016488
Is the condition related to putting the Ring into play an "effect, cost, [or] targeting applied to cards"?
A player, 26 April 2011
Does a battle action taken off a stronghold count towards putting Ring of Water into play?
Yes, a Stronghold is a card with a title therefore its Battle action counts to put the Ring of Water into play.
Is the condition related to putting the Ring into play an "effect, cost, [or] targeting applied to cards"?
No. For more information about effects, costs and targeting, see Effects, Costs and restrictions, and Targeting.