Avenal VII
Avenal VII was the seventh planet in its star system. This system was located deep within Cardassian space. 

In 2375, Chancellor Gowron ordered General Martok to launch an ill-advised attack on this planet. The attack was a disaster, as the Klingons were outnumbered six to one: seven Klingon warships were destroyed, and five more severely damaged, with General Martok himself in the sickbay of the  in critical condition. The attack was nothing short of a waste of ships, manpower and war materials for the allies. ()

Appendices

Background information 

"AV-in-ell" was the pronunciation for this planet's name from the script pronunciation guide. '

This planet's quadrant of origin is inferred based on the position of the Cardassian Union as seen in the star chart appearing in the  episode .

According to Star Trek: Star Charts (p. 46) and Stellar Cartography: The Starfleet Reference Library'' ("Stellar Cartography", pp. 18-19; "Federation Historical Highlights, 2161-2385"), Avenal VII was located in the Avenal system. This was a binary system with a pair of B-class stars. According to a map of the Cardassian Union – prepared by an anonymous astrography clerk, from the Cardassian Central Archives, in 2364 – Avenal was identified as a Cardassian system.

External link 
 

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Avenal 07