KTF/Dominion War

The extent of the involvement of the Empire in the Dominion War To fully appreciate the role the Klingon empire played in the Dominion War, it's important to note that this conflict was preceded by two smaller conflicts, the war between the Empire and the Cardassian Union on one end, and between the Empire and the Federation on the other. Both these conflicts were inextricably linked with each other, and inevitably paved the way for the inevitable outbreak of war with the Dominion.

The wars with Cardassia and the Federation
In 2372 the Klingon High Council received reports that the Cardassian Central Command had been overthrown by a popular uprising, and that power had been restored to the civilian Detapa council. High Command became convinced that the revolt had been instigated by the Dominion, and that the Detapa council had been infiltrated by Founders. General Martok immediately called for a massive invasion of Cardassian space to end the Changeling threat. In response to this chancellor Gowron ordered an invasion of Cardassia in early 2372. An advance task force of over fifty warships was dispatched to Deep Space 9, under pretext of defending the station against a Dominion incursion. The federation, however, condemned the action and refused to participate. In response, chancellor Gowron withdrew from the Khitomer Accords, and proceeded with the invasion into Cardassian space, nevertheless. Simultaneously, Gowron demanded a Federation withdrawal from the Archanis sector, and when the latter refused to comply, he launched a fullscale attack on Federation assets.

Meanwhile, the Empire's incursion into Cardassian space was proceeding smoothly. The outlying Cardassian colonies were almost immediately overwhelmed. Closer to Cardassia Prime, the Imperial fleet were met with some resistance from the Cardassian fleet, but still managed to break through. In a daring rescue attempt, the Cardassian Detapa council was spirited away from the planet, and given shelter on board Deep Space 9. In response, the Imperial fleet attacked the space station, but was eventually routed. In the following few months cloaked Klingon warships waged a war of attrition on the Cardassian Union, creating a humanitarian crisis, and paving the way for the Cardassian state's absorption into the Dominion. In the meantime, the Federation was harboring suspicions that chancellor Gowron had been replaced by a Founder. A covert ops team infiltrated Klingon military headquarters with the intention to expose the Gowron impersonator, only to discover that it was Martok who was the impersonator. With the impostor exposed and the real Martok reinstated, a ceasefire was called and the Khitomer accords resigned, but by that point the Cardassians had already been in secret negotiations to join the Dominion, and by mid2373 a massive Jem'Hadar fleet crossed the Bajoran wormhole into Cardassian space, inflicting massive casualties on the Klingon forces, forcing chancellor Gowron to issue a general retreat.

The Dominion War
Following shortly after the Empire's initial contact with the Jem'Hadar fleet in Cardassian space, General Martok contacted Deep Space 9 from his vantage point near the Cardassian border, warning them that a large contingent of Cardassian and Dominion vessels were en route to the station to attack it. His transmission was cut short when the Dominion fleet jammed his communication.

◦ Precisely because the mass/energy of the moon was submerged into subspace, it passed through Qo'nos with minimal interaction. Electromagnetic interaction between the blast wave and the ozone molecules in the atmosphere of Qo'nos resulted in the disruption of molecular bonds in those very ozone molecules, which led to the loss of the ozone layer itself. This also explains why space stations in the vicinity of Qo'nos were not destroyed. As they are stationary, their mass would have been entirely in real space (just like the mass of Qo'nos itself) and they would have sustained only slight damage as a result of their weak interaction with the subspace energy of the shock wave. All of the denizens and structures on Qo'nos would have suffered mild cellular and molecular damage, since the blast wave would have passed through the entire planet with the same weak interaction that had caused the destruction of the ozone layer. The Klingon High Command may have conceivably concealed this information from its populace and outsiders to keep the true extent of the disaster from becoming public knowledge.
• How could we see the shock wave moving towards us? After all, it was moving in excess of the speed of light, so we should not have been able to see anything until the moment the shock wave had reached us, as it would quite literally have been outracing its own image.
◦ The scene must have been depicted from the perspective of a starship or space station near Qo'nos. View screens on star ships and space stations are programmed to create visible representations of objects that are not normally visible.
• Why was the shock wave a planar ring?

◦ Simply put, the shock wave could not have been a planar ring. It must have been a spherically-expanding phenomenon. The planar shape of the blast wave had to be part of the visual algorithms of view screens on nearby star ships and space stations. These algorithms are designed to depict space phenomena in such a manner that the crew can see the phenomena and react to it, without having the entire view screen obscured. If the shock wave had to be depicted in its true, spherical shape, then nothing behind the wave

Sources
http://memory-alpha.org/wiki/Dominion_War
The Starfleet Survival Guide, David Mack, ISBN 0743418425