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{{Status|Canon}}
{{Era|HCW}}


'''United Nations Space Command After-Action Report: Battle Group Sierra-3''' was an official [[UNSC]] [[wikipedia:After action report|after action report]] concerning the [[Battle of 18 Scorpii]] in [[2543]]. It detailed the victory of [[UNSC Navy]] [[Battle Group Sierra-3]] over a [[Covenant]] {{Pattern|Sinaris|heavy destroyer}}, as well as the involvement of unidentified friendly reinforcements which proved instrumental in deciding the engagement's outcome.<ref>'''[[Halo: Evolutions - Essential Tales of the Halo Universe]]''', ''[[The Impossible Life and the Possible Death of Preston J. Cole]]'', page 324 (2010 Edition, Vol. I)</ref>
'''United Nations Space Command After-Action Report: Battle Group Sierra-3''' was an official [[UNSC]] [[wikipedia:After action report|after action report]] concerning the [[Battle of 18 Scorpii]] in [[2543]]. It detailed the victory of [[UNSC Navy]] [[Battle Group Sierra-3]] over a [[Covenant]] [[CPV-class heavy destroyer]], as well as the involvement of unidentified friendly reinforcements which proved instrumental in deciding the engagement's outcome.<ref>'''[[Halo: Evolutions - Essential Tales of the Halo Universe]]''', ''[[The Impossible Life and the Possible Death of Preston J. Cole]]'', page 324 (2010 Edition, Vol. I)</ref>


An excerpt of the after action report was included in the file ''[[Historical/Psychological Analysis of Cole, Preston J.]]'', sent by [[Codename: SURGEON]] to [[Codename: USUAL SUSPECTS]] in [[2552]].<ref>'''Halo: Evolutions - Essential Tales of the Halo Universe''', ''The Impossible Life and the Possible Death of Preston J. Cole'', pages 324-325 (2010 Edition, Vol. I)</ref> SURGEON believed that [[Vice Admiral]] [[Preston Cole]], head of [[FLEETCOM Sector Three]], had most likely read the report and concluded from it that his wife [[Lyrenne Castilla]], the [[Insurrectionist]] [[Commanding officer|captain]] of the ''[[Bellicose]]'', had actually survived the [[Battle of Theta Ursae Majoris]] in [[2504]].<ref>'''Halo: Evolutions - Essential Tales of the Halo Universe''', ''The Impossible Life and the Possible Death of Preston J. Cole'', page 325 (2010 Edition, Vol. I)</ref> Because of this, SURGEON held that the Sierra-3 After-Action Report provided context that was critical in understanding Cole's later actions at the [[Battle of Psi Serpentis]].<ref>'''Halo: Evolutions - Essential Tales of the Halo Universe''', ''The Impossible Life and the Possible Death of Preston J. Cole'', pages 325-326, 340 (2010 Edition, Vol. I) - ''"I start this section with the Sierra-3 After-Action Report as it was the catalyst for what happened next (or so I believe)."''</ref>
An excerpt of the after action report was included in the file ''[[Historical/Psychological Analysis of Cole, Preston J.]]'', sent by [[Codename: SURGEON]] to [[Codename: USUAL SUSPECTS]] in [[2552]].<ref>'''Halo: Evolutions - Essential Tales of the Halo Universe''', ''The Impossible Life and the Possible Death of Preston J. Cole'', pages 324-325 (2010 Edition, Vol. I)</ref> SURGEON believed that [[Vice Admiral]] [[Preston Cole]], head of [[FLEETCOM Sector Three]], had most likely read the report and concluded from it that his wife [[Lyrenne Castilla]], the [[Insurrectionist]] [[Commanding officer|captain]] of the ''[[Bellicose]]'', had actually survived the [[Battle of Theta Ursae Majoris]] in [[2504]].<ref>'''Halo: Evolutions - Essential Tales of the Halo Universe''', ''The Impossible Life and the Possible Death of Preston J. Cole'', page 325 (2010 Edition, Vol. I)</ref> Because of this, SURGEON held that the Sierra-3 After-Action Report provided context that was critical in understanding Cole's later actions at the [[Battle of Psi Serpentis]].<ref>'''Halo: Evolutions - Essential Tales of the Halo Universe''', ''The Impossible Life and the Possible Death of Preston J. Cole'', pages 325-326, 340 (2010 Edition, Vol. I) - ''"I start this section with the Sierra-3 After-Action Report as it was the catalyst for what happened next (or so I believe)."''</ref>
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:Battle Group Sierra-3 engages Covenant in 18 Scorpii.
:Battle Group Sierra-3 engages Covenant in 18 Scorpii.


:'''PRELIMINARY:''' Battle Group Sierra-3, comprising two [[UNSC destroyer]]s and one [[cruiser]], engaged a Covenant CPV-class heavy destroyer in the [[18 Scorpii system]], March 6, 2543 ([[Military Calendar]]). The {{UNSCShip|Seattle}} and ''[[UNSC Thermopylae|Thermopylae]]'' sustained moderate damage, while the ''[[UNSC Io|Io]]'' sustained heavy damage. Covenant vessel destroyed.  
:'''PRELIMINARY:''' Battle Group Sierra-3, comprising two [[UNSC destroyer]]s and one [[Cruiser|cruiser]], engaged a Covenant CPV-class heavy destroyer in the [[18 Scorpii system]], March 6, 2543 ([[Military Calendar]]). The {{UNSCShip|Seattle}} and ''[[UNSC Thermopylae|Thermopylae]]'' sustained moderate damage, while the ''[[UNSC Io|Io]]'' sustained heavy damage. Covenant vessel destroyed.  
:'''SUMMARY ADDENDUM:''' The Covenant ship inflicted heavy damage and Sierra-3 group was unable to peel its [[Energy shielding|shields]]. ''Io''<nowiki>'</nowiki>s [[Shaw-Fujikawa Translight Engine|FTL drive]] was inoperative, so I faced a decision to fall back and save two destroyers, or fight and possibly lose all those ships. Reinforcements arrived when unknown friendly ships jumped in-system. Additional firepower penetrated enemy shields.  
:'''SUMMARY ADDENDUM:''' The Covenant ship inflicted heavy damage and Sierra-3 group was unable to peel its [[Energy shielding|shields]]. ''Io''<nowiki>'</nowiki>s [[Shaw-Fujikawa Translight Engine|FTL drive]] was inoperative, so I faced a decision to fall back and save two destroyers, or fight and possibly lose all those ships. Reinforcements arrived when unknown friendly ships jumped in-system. Additional firepower penetrated enemy shields.  
:Lead reinforcement ship's silhouette matched a [[Charon-class light frigate|thirty-year-old UNSC frigate design]] with major modifications (see technical reports attached). [[Identification friend or foe|Passive transponder]] pinged and yielded a [[UNSC REG system|ship reg. number]], identifying the UNSC ''Bellerophon''. Friendlies jumped out-system before [[COM|comm]] contact established.  
:Lead reinforcement ship's silhouette matched a [[Charon-class light frigate|thirty-year-old UNSC frigate design]] with major modifications (see technical reports attached). [[Identification friend or foe|Passive transponder]] pinged and yielded a [[UNSC REG system|ship reg. number]], identifying the UNSC ''Bellerophon''. Friendlies jumped out-system before [[COM|comm]] contact established.  
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==Sources==
==Sources==
{{Ref/Sources}}
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[[Category:Files]]
[[Category:Files]]
[[Category:Historical/Psychological Analysis of Cole, Preston J.]]
[[Category:Historical/Psychological Analysis of Cole, Preston J.]]

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