Aramus

Force Commander during both Aurelian Crusades. Though technically unnamed, the name Aramus was given in the novel.

Aramus led elite strike forces all over the Aurelian Sector, assassinating key Ork Bosses, Eldar leaders, and Tyranid Synapse creatures, buying time for the arrival of the 3rd Company under Gabriel Angelos.

He is also responsible for the death of the Ork Warboss, the death of the Ulthwe Farseer, the destruction of the Ulthwe Avatar of Khaine, and the death of the Hive mind through the use of bio toxins.

By the end of the campaign, Aramus, Thaddeus, and Avitus all earn Terminator Honors (Tarkus already had those before the campaign.)

Picture taken from Dawn of War II Official Website.
Sources:
Dawn of War II
Dawn of War II: Chaos Rising
Dawn of War II Novel

Eagle Warriors

Chapter Master: Gaius Aegius
Founding Chapter: Ultramarines
Successor Chapters: Unknown
Number: Unknown (Presumed ~1000)
Homeworld: None (Fleet-based)
Founding: Second Founding
Primarch: Roboute Gulliman (through Ultramarines)
Allegiance: Imperium of Man

Overview: A fleet-based chapter continually on campaign in the systems conquered by Robute Gulliman during the Great Crusade.

Notable Campaigns:

• The Eagle Warriors participated in the Balur Secundus Strike Force.
• The 4th company earned particular renown in the battle for Medusa V.
• A score of terminators participated in the Zeist campaign under the leadership of the Ultramarines.[2]

Sources:
1 Codex: Space Marines 5th Edition (2008). Ward, Matthew , Nottingham: Games Workshop.
a p.24
b p.48
2 Codex: Space Marines 3rd Edition (1998). pp. 22-23 Chambers, Andy , Nottingham: Games Workshop. (through warhammer40k wikia)

Pictures taken from warhammer40k wikia

Space Marine Chapters

• Alpha Legion (Traitor)
  
• Angels of Fury
  
• Aurora Chapter
  
• Black Consuls
• Black Legion (Traitor)
  
• Blood Angels
  
• Blood Ravens
• Blood Swords
  
• Brazen Claws
• Celestial Guard
• Crimson Castellans
  
• Crimson Fists
• Crimson Paladins
  
• Dark Hunters
• Dark Sons
  
• Death Spectres
• Death Strike
  
• Doom Legion
• Dragon Lords
  
• Eagle Warriors[1] - Created during the 2nd founding from the Ultramarines, the Eagle Warriors are a fleet-based chapter continually on campaign in the systems conquered by Robute Gulliman during the Great Crusade.
• Emperor's Children (Traitor)
  
• Emperor's Hands
• Emperor's Swords
  
• Exorcists
• Fire Hawks
  
• Fire Lords
• Flesh Tearers
  
• Genesis Chapter[1] - First among the Progenitors.
  
• Hawk Lords
• Honoured Sons
  
• Howling Griffons
  
• Imperial Fists
• Invaders
  
• Iron Hands
  
• Iron Knights
• Iron Lords
• Iron Warriors (Traitor)
  
• Knights of Gryphonne
  
• Knights of the Raven
• Legion of Night
• Luna Wolves (Traitor)
  
• Marines Exemplar
  
• Mentors
• Night Watch
  
• Novamarines
• Omega Marines
  
• Praetors of Orpheus
• Raven Guard
• Red Legion
  
• Red Talons
  
• Red Wolves
  
• Relictors
  
• Sable Swords
  
• Salamanders
  
• Silver Skulls
• Skull Bearers
• Sky Sentinels
• Sons of Horus (Traitor)
  
• Sons of Orar
• Subjugators
  
• Space Wolves
  
• Star Dragons
• Storm Falcons
  
• Storm Hawks
• Storm Wings
• Nameless
• Tigers Argent
  
• Ultramarines
• White Consuls
• White Panthers
  
• White Scars
• White Templars
• Word Bearers (Traitor)

Sources:
1 Codex: Space Marines 5th Edition (2008). pp. 24 Ward, Matthew , Nottingham: Games Workshop.

Gabriel Angelos

Captain of the Blood Ravens 3rd Company.

Key Battles:
Ordered an exterminatus on the Blood Ravens recruiting world of Cyrene.
Led the 3rd Company on Tartarus.
Reinforced Aramus on Typhon during the First Aurelian Crusade.

Image taken from giantbomb.com

Crusades of the Black Templars

378.M36 - The Wars of Apostasy
When the insane High Lord of the Administratum, Goge Vandire, declared himself both Ecclesiarch and High Lord of the Administratum he began the now infamous Reign of Blood, a time of terror in which millions died in the fires of megalomaniacal paranoia. Violent repression and wanton slaughter were the hallmarks of his reign until a holy man by the name of Sebastian Thor rallied the faithful to stand against Vandire. During this time, the Black Templars had concerned themselves little with the affairs of the Imperium, but when Crusade fleets returned to Segmentum Solar and discovered that their Chapter keeps had been destroyed by orbital bombardments, the full extent of Vandire's treachery became apparent. High Marshal Sigenandus declared a Crusade against Vandire and, together with their Primogenitor Chapter, the Imperial Fists, two other Chapters - the Fire Hawks and the Soul Drinkers - and the Martian Tech Guard, the Black Templars took the fight to Terra itself.
For months the combined armies laid siege to the Ecclesiarchal Palace without success until a forlorn hope led by Emperor's Champion Navarre assaulted a breach in the outer walls. The fighting waxed fierce and when the bearer of the Chapter Banner fell, Navarre lifted it high and carried the holy icon across the breach to victory. After the battle, Chapter Master Lazerian of the Imperial Fists honoured Navarre with the title of Captain of the Banner in recognition of his exemplary bravery. With the capture of the outer walls, forces loyal to the Emperor fought within the precincts of the palace, something that had not happened since the dark days of the Horus Heresy. The siege was ended with the death of Vandire at the hands of Alicia Dominica, leader of the Brides of the Emperor, the High Lord's personal bodyguard who now learned the awful truth of Vandire's reign. With Vandire dead and Sebastian Thor appointed Ecclesiarch, Sigenandus led his warriors from Segmentum Solar to further prosecute the enemies of the Emperor. Though Vandire's death ended the Reign of Blood, the Age of Apostasy was to continue for centuries and Sigenandus spent the rest of his life hunting down those who had broken faith with the Emperor.

Battles of the Ultramarines

As taken from Codex Space Marines 5th Edition

• 745.M41 - The Tyranids enter the galaxy and the Tyrannic Wars begin. Hive Fleet Behehmoth descends upon the realm of Ultramar, laying waste to several planets. Only by the valour and determination of the Ultramarines is the threat of Behemoth ended, though the cost is high.

• 762.M41 - Marneus Calgar leads the remnants of his Chapter against the Daemon-corrupted forge world of Thrax. Under the leadership of their Chapter Master, the Ultramarines banish countless thousands of Daemons and recover crucial data-records from the twisted manufactorum complexes. With the mission complete, Calgar issues the order for Exterminatus.

• 797.M41 - The Siege of Zalathras. Marneus Calgar, Chapter Master of the Ultramarines, holds the gate alone against the greenskin horde for a night and a day.

• 799.M41 - The Ultramarines begin to fortify the eastern bounds of their realm against the emergent forces of the upstart Tau Empire.

• 805.M41 - Waaagh! Gutshredda rampages through the Forgoil system. Marneus Calgar leads three companies to the assistance of the Forgoil Planetary Defense Forces. In a little more than three weeks, the Ultramarines destroy the tellyporta ships and Stompa factories that provided Waaagh! Gutshredda with much of its momentum. In the final battle of the war, Calgar and his Terminator-armoured retinue board and destroy Gutshredda's flagship, Da Supadestructa.

• 815.M41 - Contact is lost with Explorator Fleet 913. The Ultramarines send three companies to investigate, but find only empty vessels drifting in deep space.

• 841.M41 - The Ultramarines' 1st Company's operational strength exceeds fifty percent for the first time since the Battle for Macragge.

• 849.M41 - Brother Captain Cato Sicarius is appointed as High Suzerain of Ultramar.

• 855.M41 - Assault on Black Reach. The Ultramarines 2nd Company defeats Waaagh! Zanzag.

• 861.M41 - Chapter records indicate that the Ultramarines have finally replaced the losses incurred during the Battle for Macragge.

• 878.M41 - Chaos pirates, led by the Daemon Prince M'kar the Reborn, claim several uninhabited worlds on the borders of Ultramar. In a decisive battle in the Halamar Rift, Captain Sicarius destroys much of the pirate fleet, although M'kar the Reborn escapes into the Warp.

• 888.M41 - The Battle of the Sepulchre. Eldar from the Alaitoc and Iyanded Craftworlds assault the planet Commrath. For the first time since the Battle for Macragge, Marneus Calgar leads the entire Ultramarines Chapter to war. At the pivotal Battle for Orar's Sepulchre, Calgar defeats the Alaitoc Avatar in single combat, breaking the spirit of the surviving invaders.

Notable Blood Ravens

• Aramus - Force Commander during both Aurelian Crusades. Member of the Fourth Company.
• Avitus - Fourth Company Devastator Sergeant. Served alongside Davian Thule during the Kronus Campaign, and along Aramus during both Aurelian Crusades. Distinguished himself during the battle of Victory Bay against the 1st Kronus Regiment during the Kronus Campaign.
• Corallis - Served along Gabriel Angelos during the Tartarus Campaign. Member of the Third Company. Executed Protocol 18 and destroyed the Ork artillery during the defense of Magna Bonum.
  
• Cyrus - Scout Sergeant. Served in the Deathwatch. Distinguished himself in the defense of Victoria Prime. Served alongside Aramus during both Aurelian Crusades.
• Davian Thule - Force Commander during the Kronus Campaign. Headed the defense of Calderis until being mortally wounded by a Tyranid Warrior during the beginning of their invasion. Currently interred in a Dreadnought and serves alongside Aramus.
• Gabriel Angelos - Captain of the Third Company. Headed the Tartarus Campaign. Reinforced Aramus during the battle of Typhon Graveyard.
• Georg - Chaplain who wielded the Thunder Hammer Undeniable Hammer of Truth.
• Gordian - Apothecary on the Strike Cruiser Armageddon. Killed when the Armageddon was destroyed above Typhon.
• Indrick Boreale - Force Commander during the Kaurava Campaign. Killed in action.
• Isador Akios - Librarian serving in the Third Company. Executed by Gabriel Angelos for heresy and betrayal.
• Karolus - Sergeant of the Seventh Company who wore the Power Armor Cuirass of Azariah.
• Martellus - Techmarine of the Strike Cruiser Armageddon.
• Matiel - Served along Gabriel Angelos. Member of the Third Company. Led 2nd Squad in the defense of Magna Bonum.
  
• Narine - Scout who wore the Scout Armor Grim Silence.
• Tanthius - Served along Gabriel Angelos. Member of the Third Company. Led 9th Squad in the defense of Magna Bonum
  
• Tarkus - Fourth Company Tactical Sergeant. Served alongside Davian Thule during the Kronus Campaign, and along Aramus during both Aurelian Crusades. Distinguished himself twice during the Kronus Campaign, first against the Tau and again against the Necron. Holds Terminator Honors.
• Thaddeus - Fourth Company Assault Sergeant. Served alongside Aramus during both Aurelian Crusades.