Offense vs. defense.
Ok... I'll give this a shot, though I may end up off-target by several light years.
What
Christopher is saying is: Starfleet (and the Feds in general) do not
pick fights. They do not conquer, they do not seek conflict, they do not respond with force at the drop of a hat. They view the application of violence as a last resort, if a sometimes necessary one. Their weapons are "defensive", meaning, they arm their ships and personnel due to that unfortunate but acknowledged reality that force IS sometimes necessary if you are going to be out there exploring the galaxy and interacting with all these other powers. And that's pretty much correct.
What
Saquist is saying is that in terms of the capabilities of the starship itself, once so armed, "offense vs. defense" in that context is somewhat irrelevant. Starfleet's tactical doctrine, and the Federation's overall philosophy, do not change the fact that Starfleet vessels have formidable weapons. Politics and policy dictate how they SHOULD be used, but in practice, armed is still armed. A Galaxy-class starship can still be used to attack and destroy a target very effectively, just as a Vor'cha-class cruiser or a D'deridex-class warbird can. He's not talking about what they SHOULD do, but what they CAN do. And certainly,
during a war, Starfleet can and will "take the offensive", as we saw during DS9. And
that's pretty much correct as well.
Am I in the ballpark?
Fleet strength:
We know that Sisko wanted to match the Dominion Fleet of 1200 with ELEMENTS of the 7th, 5th and 9th fleets and a Klingon contingent. Those are quarters. If we apply that to the actual fleet since we know there was only 600 and two elements while the 9th Fleet element never arrived. That implies that an element size maybe 300. If there are indeed 4 elements to every fleet (conjecture of course) Then most fleets are 1,200 strong. With 10 Fleets on Record that's 12,000 ships.
I personally support more fleets of lesser size, though that's
pure speculation since we can't know one way or the other. That aside, as
Jono pointed out, the 7th fleet wasn't part of OR. And on the 7th, it was stated to be 112 ships prior to getting pounded. This would suggest that not all fleets are necessarily the same size; it might depend on the fleet's assignment and/or class composition.
This matches the canon description of 30,000 plus Dominion Cardassian ships.
Eh? Canon? When was this? I don't recall such a number (or ANY number, actually) being given for the total Dominion fleet strength.
Registry numbers: I personally have never felt that the registry numbers reflect that Starfleet has ACTUALLY built 70k + ships. I do, however, think that a total fleet strength for Starfleet of 10-15k starships (meaning, 10-15k not including runabouts and whatnot) around the time the Dominion War began makes sense. But that, too, is - at least to some degree - personal preference and speculation. The numbers we DO get in the show suggest at least several thousand, but preclude there being tens of thousands (if Starfleet had TENS OF THOUSANDS of full starships, 2400 Dominion reinforcements would have been like "Pfft, bring em on"). But beyond establishing certain minimums and maximums, we can't KNOW just how many ships Starfleet has in total during a given era. There just isn't enough canon information.
I'm sorry but Starfleet is a military organization with an exploratory arm. You don't have designations such as frigate or heavy cruiser to denote explorers. Every Federation ship we have seen have some sort of offensive capabilities (phasers, torpedoes) and defensive capabilities (shields) down to the little runabout.
Perhaps I'm a big dummy but that is exactly how I see it.
This is...
similar to how I see it. I would agree with the statement "Starfleet is the Federation's military." They are the organization that defends the populace and fights the wars, regardless of how much the Feds try to
avoid war. But not everyone agrees with this (there's a whole crazy huge thread in General about this very topic). But, I think calling them a "military organization with an exploratory arm" is
way off. In TIMES of war (or any crises), their role as protector takes precedence over everything else. However, Starfleet is pretty massive, and when the crap is nowhere near the fan, they pour a huge amount of their resources into space exploration and scientific endeavors. The defensive role takes priority when it comes up because it
has to; lives are at stake in those situations, and the continuing existence of the UFP itself at times (certainly, that was threatened by both the Dominion War and the events of the "Destiny" novels). But when there is no looming threat, their exploratory and scientific force is far more than an "arm."
Tzenkethi war: I've got no idea. It was a little weird, frankly, how they just threw that in all of a sudden in "The Adversary." "Oh yeah, there was this other war around the early TNG time frame..."
Cardassian war: I always had the impression that the Federation was never in any danger of losing this war to the point where they would be overrun/conquered by the Cardies, or anything close to it. But at the same time, they weren't one of those wimpy little species that pose so little of a real threat that you can safely just push your arm against their forehead and hold them away from you while they flail harmlessly at the air. Starfleet military technology was certainly leagues better than their Cardassian equivalent by the time of "The Wounded", but maybe things were closer to being equal (ish) during the war. Perhaps it started as an intense border war, that
could have erupted into something more, but never did, due to Starfleet's somewhat rapid (considering how short a period of time it was) technological improvements during the course of it. Overtime, the Cardassians would have had a harder and harder time mounting an effective offense, but by then they didn't want to give up either (the Cardassian military and government have both been shown to be pretty damn stubborn at times). So it became less intense, but it didn't
stop either, not until years later, when the full treaty was finally hammered out. Thus, during early TNG, there were technically still "border wars", but they were only still going on because the Federation was at something of a loss as to how to deal with this implacable, yet barely threatening, foe. Hence, the Ent-D off doing other stuff even though there is technically still this conflict happening in the background.
Was the Defiant used defensively when Sisko contaminated the atmosphere of Solosos III?
Remember how shocked everyone was? Even Klingon warrior Worf thought it was wrong.
Sisko was lucky no one died, but even so the contrivance that the Cardassian and Human colonists could just swap planets was a convenient bit of scripting.
You know, I was never happy with the resolution of that ep. It felt off that Sisko actually went through with it, and it also felt off that there were no consequences. Sure, everything kind of worked out because of the aforementioned colony-swapping; I would think Starfleet would still have a thing or two to say to Sisko about actually launching the thing, regardless of that extremely convenient reality that the colonists could simply switch planets. This in a show that was
known for showing consequences in a way that other Treks didn't... not one of DS9's finer moments, IMO.
What would have been great is if it was all a ruse. The warhead was a dud. Only Sisko and one nameless dude who was working somewhere down in the bowels of the ship, prepping the torpedo, knew the truth. Everyone on the bridge thought Sisko was ACTUALLY doing it, even Worf, so that Eddington wouldn't be able to sense deception from any of their reactions. So the torpedo is launched, and maybe it gives off some phony readings just long enough for Eddington to surrender as Sisko threatens to do the same thing to colony after colony... then it's revealed that the torp didn't actually
do anything.
And an on-topic note (fancy that!

): I like the Luna-class, though I never thought it was supposed to be a combat-oriented ship either. Regarding the existence of design similarities with the Akira, yet the lack of
role similarities assuming the Akira IS a combat-heavy vessel, I don't think that elements such as under-slung nacelles, a rollbar/pod, etc. are necessarily
indicative of role. In the Akira's case, the rollbar is a weapons pod, but that's because it was designed as a combat ship; the Luna-class might have a torpedo launcher or two in that thing, but it's mainly a sensor pod. Nacelle positioning would seem to have more to do with ensure the ship can create and maintain a stable warp field than its role. For another example, the shape, angle, and position of the pylons and nacelles relative to the hull are quite similar on the Nova and Sovereign classes, yet the former is much smaller and does not share the same role in the fleet as the latter.