Battle of Donatu V

• Major conflict at Donatu V between United Federation of Planets and Klingon Empire (TOS: "The Trouble with Tribbles")
  • First significant skirmish between the two powers (TOS: "The Trouble with Tribbles")
• Klingon Empire harried planet-side Federation colony as intrusion into Klingon space 2242 (TOS Novel: Errand of Vengeance: Killing Blow)
• USS Endeavor responded, was quickly destroyed by two battle cruisers in orbit (TOS Novel: Errand of Vengeance: Killing Blow)
• USS Yorkshire followed up upon receiving USS Endeavor automated distress signal (TOS Novel: Errand of Vengeance: Killing Blow)
• Shortly after second engagement, USS Constitution joined conflict (TOS Novel: Errand of Vengeance: Killing Blow)
• Further vessels joined, including two additional Klingon battlecruisers, two additional Federation starships (TOS Novel: Errand of Vengeance: Killing Blow)
• Results
  • Significant losses on both Federation and Klingon sides (TOS Novel: Errand of Vengeance: Killing Blow)
  • Klingons ceded territory to Federation
    • Viewed as significant dishonor to Klingon Empire, laying groundwork for discontent driving both 2256 Federation-Klingon War and 2267 Federation-Klingon War