Star Trek: Fortunes of War
Star Trek: Fortunes of War is the retroactively-applied term for a duology of Pocket TOS novels written by Diane Carey and published by Pocket Books. The term was applied with a  reissue of the two novels.

Novels 
 TOS #29: Dreadnought!
 TOS #31: Battlestations!

Unpublished sequels 
 Sequels for this series were discussed in the  issue of  magazine (#159) when Carey was interviewed by Wanda J. Hall. A sequel called By Logic Alone would star Piper, and a follow-on two-parter focused on Kirk, but featuring Piper, would be called The Federation Mutiny. The novels were never released.

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Fortunes of War