Attach to a Warship location you control. Attached location is immune to non-plot card effects.
Add 3 to your total STR during any [Military] challenge in which you control at least 1 attacking character.
I've always though of this attachment as only effective when I am attackling but does the naval option changes that? - i.e.:
Someone attacks me (Military), and I declare defenders
I can I then kneel a 1 strength character with a military/naval icon as a attacker
Does this mean I then get +3 added to my total strength (on defense) for rach Outfitted for War that I have in play?