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'''Sentinels''' are autonomous machines created by the [[Forerunner]]s, designed for the construction, maintenance and defense of their structures and facilities.<ref name="p167">'''[[Halo: The Essential Visual Guide]]''', ''page 167''</ref> Various Sentinel variants exist, each tailored to a specific task; because of its ubiquity, the [[Aggressor Sentinel|Aggressor]] variant is often referred to simply as the "Sentinel". Most variants are produced by [[Sentinel manufacturing facility|Sentinel manufacturing facilities]], [[Sentinel factory|Sentinel factories]], or [[Sentinel launcher]]s. The Sentinels were revered by the [[Covenant]] as "holy warriors of the [[Halo Array|Sacred Rings]]",<ref>'''[[Halo 2]]''', campaign level ''[[The Arbiter]]'' - ''"A Whisper in the Storm"''</ref><ref>'''Halo: Hunters in the Dark''', ''page 83'' (Google Play edition)</ref>  despite engaging them in combat on various occasions.
'''Sentinels''' are autonomous machines created by the [[Forerunner]]s, designed for the construction, maintenance and defense of their structures and facilities.<ref name="p167">'''[[Halo: The Essential Visual Guide]]''', ''page 167''</ref> Various Sentinel variants exist, each tailored to a specific task; because of its ubiquity, the [[Aggressor Sentinel|Aggressor]] variant is often referred to simply as the "Sentinel". Most variants are produced by [[Sentinel manufacturing facility|Sentinel manufacturing facilities]], [[Sentinel factory|Sentinel factories]], or [[Sentinel launcher]]s. The Sentinels were revered by the [[Covenant]] as "holy warriors of the [[Halo Array|Sacred Rings]]",<ref>'''[[Halo 2]]''', campaign level ''[[The Arbiter]]'' - ''"A Whisper in the Storm"''</ref><ref>'''Halo: Hunters in the Dark''', ''page 83'' (Google Play edition)</ref>  despite engaging them in combat on various occasions.


The Sentinels follow the command of the [[monitor]] or other [[ancilla]] that is in charge of the facility they are assigned to, but even without central direction, they are able to respond to threats against their assigned installations with remarkable coordination and effectiveness.<ref>'''Halo Wars 2''', ''[[Phoenix Logs]] — Forerunner Sentinels''</ref><ref>'''[[Halo Wars 2]]''', campaign level ''[[Under The Dark]]''</ref> On [[Installation 00]], a sentinel defense network is used to coordinate the Sentinels on the Ark despite [[000 Tragic Solitude|the monitor]] no longer being present. Sentinels follow their directives even if this entails engaging other Forerunner machines. For example, the Aggressor Sentinels of [[Requiem]] remained loyal to the [[Librarian#Imprint_on_Requiem|Librarian]] against the [[Ur-Didact|Didact]]'s [[Promethean#Mechanical_Prometheans|Promethean]]s in [[2557]]. Another instance is when the Constructors of [[Genesis]] remained loyal to [[Monitor]] [[Exuberant Witness]] against the [[Created]]'s Promethean forces in [[2558]].  
The Sentinels follow the command of the [[monitor]] or other [[ancilla]] that is in charge of the facility they are assigned to, but even without central direction, they are able to respond to threats against their assigned installations with remarkable coordination and effectiveness.<ref>'''Halo Wars 2''', ''[[Phoenix Logs]] — Forerunner Sentinels''</ref><ref>'''[[Halo Wars 2]]''', campaign level ''[[Under The Dark]]''</ref> On [[Installation 00]], a sentinel defense network is used to coordinate the Sentinels on the Ark despite [[000 Tragic Solitude|the monitor]] no longer being present. Sentinels follow their directives even if this entails engaging other Forerunner machines. For example, the Aggressor Sentinels of [[Requiem]] remained loyal to the [[Librarian#Imprint on Requiem|Librarian]] against the [[Ur-Didact|Didact]]'s [[Promethean#Mechanical Prometheans|Promethean]]s in [[2557]]. Another instance is when the Constructors of [[Genesis]] remained loyal to [[Monitor]] [[Exuberant Witness]] against the [[Created]]'s Promethean forces in [[2558]].  


==Types of Sentinels==
==Types of Sentinels==
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A Sentinel Defense Network is a system that coordinates sentinel defenses to perform their duties in defense of an installation. All Installation has the Defense Network installed and each has its own protocol. Without the defense network activated, Sentinels are unable to perform their duties. This, however, does not affect the stationary defenses, which remain active even if the defense network is shut down, including [[containment shield]]s.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[The Archive]]''</ref> The Defense Network itself is separated to local and global defense network. The local defense network only controls sentinels surrounding terminals, while the global defense network controls defenses on a global scale. The Defense Network is linked with every defensive protocol on the installation. [[Containment protocol]] on Installation 00 is linked with the Defense Network and Sentinels cannot conduct the protocol if the network is disabled.  
A Sentinel Defense Network is a system that coordinates sentinel defenses to perform their duties in defense of an installation. All Installation has the Defense Network installed and each has its own protocol. Without the defense network activated, Sentinels are unable to perform their duties. This, however, does not affect the stationary defenses, which remain active even if the defense network is shut down, including [[containment shield]]s.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[The Archive]]''</ref> The Defense Network itself is separated to local and global defense network. The local defense network only controls sentinels surrounding terminals, while the global defense network controls defenses on a global scale. The Defense Network is linked with every defensive protocol on the installation. [[Containment protocol]] on Installation 00 is linked with the Defense Network and Sentinels cannot conduct the protocol if the network is disabled.  


[[Installation 09]] heightened the security protocol and immediately launched a [[Retriever Sentinel]] to cleanse the humans and the Banished present on the rings as soon as it left Installation 00. Professor Anders successfully hijacked the local network through the control tower to temporarily take control of Retriever Sentinel to disable barriers around the control room. <ref>'''[[Halo Wars 2]]''', Campaign level ''[[The Halo]]''</ref>
[[Installation 09]] heightened the security protocol and immediately launched a [[Retriever Sentinel]] to cleanse the humans and the Banished present on the rings as soon as it left Installation 00. Professor Anders successfully hijacked the local network through the control tower to temporarily take control of Retriever Sentinel to disable barriers around the control room.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[The Halo]]''</ref>


The Smart AI Isabel manipulated the Sentinel Defense Network to her own ends by hijacking [[Enduring Conviction]] and firing its energy projector on the Ark, causing Aggressor Sentinels to swarm on the ship and bisect it.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[Under the Dark]]''</ref>
The Smart AI Isabel manipulated the Sentinel Defense Network to her own ends by hijacking [[Enduring Conviction]] and firing its energy projector on the Ark, causing Aggressor Sentinels to swarm on the ship and bisect it.<ref>'''[[Halo Wars 2]]''', Campaign level ''[[Under the Dark]]''</ref>
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==Behind the scenes==
==Behind the scenes==
Sentinels were seen in ''[[Halo Infinite]]'''s [[Halo Infinite - E3 2018 - Announcement Trailer|announcement trailer]] at [[Wikipedia:Electronic Entertainment Expo 2018|E3 2018]].<ref name="HIT">''[[Halo Infinite]]'' [[Halo Infinite - E3 2018 - Announcement Trailer|reveal trailer]]</ref><ref name="TMOTHIAT">[https://www.youtube.com/watch?v=PTreFoLAufw '''YouTube''' - ''The Making of the Halo Infinite Announce Trailer'']</ref>
Sentinels were seen in ''[[Halo Infinite]]'''s [[Halo Infinite announcement trailer|announcement trailer]] at [[Wikipedia:Electronic Entertainment Expo 2018|E3 2018]].<ref name="HIT">''[[Halo Infinite]]'' [[Halo Infinite announcement trailer|reveal trailer]]</ref><ref name="TMOTHIAT">[https://www.youtube.com/watch?v=PTreFoLAufw '''YouTube''' - ''The Making of the Halo Infinite Announce Trailer'']</ref>


==List of appearances==
==List of appearances==