Earth-Romulan War

Before the War

Initial conflict considered as officially beginning July 22, 2155, upon destruction of Calder II science station and attacks on Alpha Centauri III and Tarod IX
- Prior aggression begun at first contact between United Earth and Romulan Star Empire
  - April 17, 2152: First contact, unnamed system, collision by Enterprise NX-01 with cloaked Romulan minefield (ENT: "Minefield")
  - Mid-November 2154: Failed attempt at provoking strife between various Sol-local powers through covert attacks by telepresence drone technology (ENT: "Babel One", "United", "The Aenar")
  - February-May 2155: United Earth covert operations intended to derail Romulan warp 7 project (ENT: The Good That Men Do)
  - February 23, 2155: Warp suicide run by Romulan vessel on Coridan to cut off Coalition access to dilithium (ENT: The Good That Men Do)
  - July 15, 2155: Destruction of ECS Horizon during initial telecapture experiments (ENT Novel: Kobayashi Maru)
Conflict initially involved full Coalition forces, but vulnerability of non-UE navies to Romulan telecapture led to withdrawal by late-2155; thus usually considered and referred to as the Earth-Romulan War (ENT Novel: Beneath the Raptor's Wing)

First non-covert action against Earth/Coalition forces
Attack on Alpha Centauri III, Calder II, Tarod IX; attempt at capturing Enterprise NX-01 in Gamma Hydra sector via telecapture technology through attack on SS Kobayashi Maru (ENT Novel: Kobayashi Maru, Beneath the Raptor's Wing)
Results
- Destruction of Calder II science station, Tarod IX outpost
- Coalition losses: DDV T'Jal; DDV Toth

Construction begins on warp-field detection grids as developed by Vulcan intended to provide defense in lieu of direct Vulcan Defense Fleet involvement (ENT Novel: Beneath the Raptor's Wing)
- Initial construction in Sol and Alpha Centauri systems, expanding to Earth colonial holdings in the following months (ENT Novel: Beneath the Raptor's Wing)

First Battle of Deneva
First proof of failure of Vulcan warp detection grid (ENT Novel: Beneath the Raptor's Wing)
- Later revealed to be through use of high-sublight attack vessels launched from outside detection perimeter (ENT Novel: Beneath the Raptor's Wing)
Results
- Destruction of Deneva Colony and occupation of Deneva (ENT Novel: Beneath the Raptor's Wing)
- Coalition losses: TSC Miracht; USS Yeager

Battle of Berengaria VII
Results
- Destruction of Berengaria VII settlements (ENT Novel: Beneath the Raptor's Wing)
- Coalition losses: Discovery NX-04 (ENT Novel: Beneath the Raptor's Wing)

Battle of Threllvia IV
Results
- Destruction of Threllvia IV colony and occupation of Threllvia IV (ENT Novel: Beneath the Raptor's Wing)
- Coalition losses: IGS Ka'Thelan Krotus, some unstated number of additional Andorian Imperial Guard vessels (ENT Novel: Beneath the Raptor's Wing)

Official surrender of the Romulan Star Empire (ENT Novel: To Brave the Storm)
- Establishment of Romulan Neutral Zone (ENT Novel: To Brave the Storm; TOS: "Balance of Terror")
- General withdrawal of Romulan diplomatic and military influence in surrounding space until mid-2260s (VAN Novel: Summon the Thunder; TOS: "Balance of Terror")