- Proud Warrior Race Guy: This branch consists of a group of people who believes that might makes right. Because they were beaten in combat, they accept their new leader and will not question his authority. Their new leader is a source of enlightenment, and serving him is their highest honor. However, any who feel their honor has been insulted will gladly join with, or at least be neutral towards, the rebels. Those who do join La Résistance usually seek to regain their group's lost glory. In battle, they are often both strong warriors and skilled strategists.
- Barbarian Marauders: Brutish, wild and dumb. The Barbarian Marauder is perfectly fine with serving under the new Evil Overlord. He may terrorize the empire's enemies, but he usually fights for little more than his own amusement. Basically, sociopaths pointed in another direction. Their brutality is offset by their simple-mindedness. If their hedonistic needs are not met, they will pick apart your empire bit by bit.
- Engineers of Doom: They are responsible for preparing the empire for war. They rarely take sides in the conflict, only working to make sure the war machine is running. They will only fight the rebels if absolutely necessary. They are often the straight man of the Battle Thralls, being the voice of reason that prevents the Chaotic Evil and Lawful Evil groups from killing each other. If the opportunity is given to rebel, they may offer a token of assistance to the heroes but will usually refrain from directly sabotaging the empire's infrastructure.
- Taskmasters: Drill Sergeants Nasty Up to Eleven. They're the guys that stand behind all the Slave Mooks and whip them into shape. Though they usually outnumber the Taskmasters, harsh punishments, indoctrination and fear tactics will make sure that the Slave Mooks will rarely rebel against them.
- Enslaved Grunts: The lowest rank of Battle Thralls, basically rounded up and given a crude weapon or bomb. They are usually employed in a Zerg Rush against their enemies. They are regarded by both sides as target practice and friendly fire is often an issue. They rarely have the courage to stand up and fight against their overlords. If not "freed" by the rebels, they often realize that their lot in life is to die anyway and thus may sacrifice themselves for the emperor, no matter how hopeless the attack is.
- Sneaky Mercs: Thieves, bandits and other lowlifes who are more than willing to harm a helpless target but flee at the first sign of danger. Their role in combat is to act as the surgical knife of the lowlifes, stealing from, sabotaging, or terrorizing their enemies. They may boast about the fact that the empire has allowed lowlifes such as themselves to live instead of executing them.
- Dogmatic Drones: Robot Mooks, a dogmatic drone army made of faceless robots united under a single leader, who either created them or gave them a purpose. Often in the Lawful Evil territory. They act as a deadlier version of a Zerg Rush. Unlike grunts, they generally don't have rebellious tendencies. Those that do rebel or otherwise break away from the main contingent are considered "defective".
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Anime and Manga
- Enslaved Grunts: The Kushan Empire uses captured enemy soldiers as frontline Cannon Fodder: They'll get killed if they try to run away, while the enemy may have difficulty shooting their countrymen.
- The new Band of the Hawk pulls a reversal on them: Kushan soldiers defeated but not killed by them are thrown on the front lines in a similar manner. However, those that manage to survive three battles are offered the chance to swear their loyalty to Griffith and, if they do so, become full members of the Band of the Hawk.
- In One Piece, Hody Jones's New Fishman Pirates is partially comprised of human slaves fitted with explosive collars. If they do not fight, they are blown up.
- In Code Geass Lloyd, "the earl of pudding" is an Engineer of Doom. Actually he is only interested in machines and doesn't really care much about humans.
- Several of the various Alternate Continuities of Captain Harlock have the Big Bads employ conquered races in their forces; Harlock himself is sometimes turning his back on a homeworld all too eager to join the ranks of the Battle Thralls that helped conquer it. Most of the other Thralls in the franchise are mixes of Enslaved Grunts and Proud Warrior Race Guys.
- Space Battleship Yamato 2199 uses this trope to perform a Cerebus Retcon of how the original changed the skin color of the Gamilas (Gamilons for Star Blazers) after the first few enemy commanders were defeated; the new version has members of other conquered species serving in the Gamilas military. Note that these guys are all volunteers: some have enrolled because their worlds have been culturally assimilated and they're patriots, while others want the first-class citizenship that comes for them and their families once they complete the term (or honorably die trying).
- Proud Warrior Race Guy: Mandalorian Clone Troopers in the Star Wars Expanded Universe. (Some Clone Troopers who valued their roots then to the Republic and later the Empire).
- In the Warhammer 40,000 background book Xenology, the Ethereals are hinted to have turned the Tau into Battle Thralls for the Eldar since their innate warp resistance meant they can't be controlled by Chaos nor be wary of being manipulated by the Eldar. The source was poetic and symbolic, spread over sources from two races on opposite sides of the galaxy; the interpretation of the text as referring to the Eldar was in-universe and it could equally apply to the Dark Eldar and human-looking Necron infiltrators (which feature heavily in the book.)
- In the Belisarius Series the Rajputs and Kushans are Proud Warrior Race guys; both of them defected though the Kushans defected earlier (the Rajputs had to be left so that Belisarius would have someone decent to fight through most of the plot). These two are more Worthy Opponents than the rather grim jackboots described above; the Rajputs are aristocratic warriors and the Kushans tough professionals, not totally unlike Romans. Their skill at siegecraft makes them Engineers of Doom as well as a Proud Warrior Race The Ye-tai are barbarian marauders; while brave enough, they tend to be uses as taskmasters, driving the conscripted peasant grunts whose main purpose seems to be to get killed one way or another. The sneaky mooks appear as well in the form of assassins which range from street thugs to ninja-like badass Stealth Experts. Interestingly, the last are what Link seems to trust must.
- The Seanchan in Wheel of Time capture and enslave female magic-users with enchanted leashes that enforce obedience and use them in combat. They consider them more like Attack Animals than this trope.
Live Action TV
- Stargate SG-1: Kull Warriors are Dogmatic Drones of the Super Soldier variety, and until a weapon specifically made to kill them quick was developed, also very hard to stop.
- Falling Skies: In season 4 the Espheni started a new program in converting human children into soldiers, by placing them in reeducation camps and convert them into Espheni. Later they created a new weapon which slowly converts humans into Espheni.
- In the Dungeons & Dragons Dark Sun setting, Enslaved Grunts come in both slave soldiers and gladiator varieties.
- Clan Warriors in BattleTech are Proud Warrior Race Guys who are expected to, if captured in battle, serve their captors as bondsmen and women. Often they are made Warriors of their capturing Clan and this practice enables Clans to add new genes and Bloodnames to their gene pools. This caused some confusion when they invaded the Inner Sphere, whose major powers typically return prisoners of war to their home nations at the soonest possible convenience.
- Warhammer Fantasy:
- The Chaos Dwarfs use orcs and goblins in this role, since they don't have enough Dwarfs to fill out their army, with hobgoblins serving as Taskmasters.
- The bulk of the Skaven armies are composed of slave rats from other Skaven clans that were conquered. They are mostly used as Cannon Fodder and their masters have no problem shooting with their own weapons (not that they wouldn't do the same to their own grunts).
- The Abyssal Dwarfs in Kings Of War use orc slaves and demonic gargoyles to boost their numbers.
- Star Control is the Trope Namer with the Hierarchy of Battle Thralls led by the Ur-Quan Kzer-Za, although you learn more about them in Star Control II.
- Proud Warrior Race Guy: The Thraddash. Possibly overlaps with the Barbarian Marauders (they're proud, but also dumb as bricks and unapologetically violent to a fault). The Yehat in Star Control II are a more straight example; being classic Proud Warrior Race Guys who serve the Ur-Quan Kzer-Za willingly under orders from their Veep-Neep Queen; in the first game, the Yehat were part of The Alliance of the Free Stars.
- Barbarian Marauders: The Ilwrath. They live for evil and became Battle Thralls to the Ur-Quan Kzer-Za solely for the purpose of obtaining sacrifices for their dark gods. The VUX are a bit of a subversion; they're intelligent and very eloquent, they're just narcissistic as heck and are heinously violently solely because they consider every non-VUX lifeform (humans especially) in the universe uglier than they are.
- Engineers of Doom: The Umgah. Pranksome geneticists that can be helpful if you can figure out why they're so quirky.
- Enslaved Grunts: The Spathi, a race of cephalopod cowards. The Mycon might also apply here, in the "living bomb" sense - they joined the Ur-Quan Slave Empire in order to gain new worlds to terraform by burying their children into its crust.
- In general, Kzer-Za policy limits the slave part of it — a race becoming Battle Thralls is supposed to be a choice by that race (with the alternative being Slave Shielding), but the choice is final... even if an Umgah practical joke made you think you were choosing to be Slave Shielded.
- Dogmatic Drones: The Mycon are the unholy combination of Planet Eaters and a Horde of Alien Locusts.
- The backstory reveals that the Ur-Quan themselves were Battle Thralls for the Dnyarri millenia ago. The green Kzer-Za were Engineers of Doom while the black Kohr-Ah were Enslaved Grunts. The reasoning behind the Ur-Quan's enslaving or killing of other species is to ensure that this never happens to them again.
- Total War
- Shogun: Total War: The Mongol's basic, cheap infantry units from the Mongol Invasion expansion are basically Korean captives/vassals pressed into service.
- You can recruit thralls in the Viking Invasion Expansion Pack for Medieval: Total War.
- In Total War: Attila, you can recruit troops from either vassal states or (if you're a Roman empire) from friendly tribes passing through your territory. Also, many of the Persians' default units are (in the fluff) troops raised from particular regional cultures.
- In Warriors Orochi, the Wei and Wu became Les Collaborateurs and Battle Thralls with Orochi
- Yuber from Suikoden is a mix of Barbarian Marauder (he destroyed a whole village because he was bored while waiting), Enslaved Grunt (he can be summoned and will work for the ones responsible for doing so.. at least until he's in danger) and Sneaky Merc (he actively seeks, craves and creates chaos and participates in most wars. However once he feels that he is in danger he will flee, usually by teleporting, and abandon the squad he was commanding and the battle he was fighting).
- Halo's Covenant has most of these, with the Prophets in charge:
- The Elites (Sangheili) are the Proud Warrior Race Guys, of course. The Brutes (Jiralhanae) are the Barbarian Marauders. The Grunts (Unggoy) are, well, the Enslaved Grunts. The Jackals (Kig-Yar) are the Sneaky Mercs. The Drones (Yanme'e) are, you guessed it, the Dogmatic Drones (though an organic insectoid form of such). And the Engineers (Huragok) are, naturally, the Engineers of Doom.
- Valkyria Chronicles: the battle thralls make up a significant part of The Empire's military might. Some of them even rise to become the Imperial nobles' right-hand men, such as Radi Jaeger.
- Darcssen finds a special niche amongst Europan battle thralls: as engineers of doom. Just look at the Calamity Raven and their advanced death-machines. Heck, even Isara technically is one: without adoption by the Welkins or her inventions, she would never be considered a full-fledged citizen of Gallia.
- In Dragon Age, the Qunari give their mages, whom they call "Saarebas" or "dangerous thing", this treatment after it becomes apparent that they can't ignore the advantages that magic brings to the battlefield. They are chained up like animals and are kept on a leash with special control rods.
- Both XCOM: Enemy Unknown and The Bureau: XCOM Declassified feature the main aliens (the Etherials and the Zudjari/Outsiders, respectively) using several other alien races that have previously been conquered by them. The final EU mission has the Big Bad give you a bit of background on each alien race, claiming they have been conquered and turned into loyal soldiers (by virtue of implants and mind control). The Bureau only really features two conquered alien races being used in combat. The Sectoids are clearly wearing some sort of control collar, and all aliens appear to be jacked into Mosaic. One cutscene has an Outsider playfully administer a Psychic-Assisted Suicide on a Sectoid. Also notable that the two battle thrall races in The Bureau (Sectoids and Mutons) appear to be nearly identical to their EU versions, at least physically, although the EU Sectoids are all clones. In fact, the goal of both Big Bad races is to turn humanity into their most promising Battle Thralls yet. Or turn humanity into Big Bad clones/spare bodies.
- The Wonderful 101: The Rival does this to individual champions of 100 different planets, threatening to destroy a world if the champion ever turns traitor or gives up. Interestingly, he has a very high opinion of his minions ("100 of the galaxy's finest") but is too worried that they'll just up and leave the moment their homeworlds are safe. They do, but not before helping him and Centinel save the galaxy from the GETHJERK.
- In Gems of War, one of the troops associated with Darkstone is the Thrall; they're presumably not happy to be fighting, and their special move actually hurts them (in addition to other effects).
- If your empire allows slavery, you can conscript your slaves into Slave Armies, which generally work best when under the watchful eyes of Comissars serving as the Taskmasters.
- You can also use 'vassalage' as a peace demand in your wars, which means you can build up an empire of Battle Thralls who you invaded and who very possibly loathe you but nevertheless send fleets to support your future war efforts. The achievement for subjugating three empires in this way is even called 'Battle Thralls.'
- Near the end of its reign, Rome, the classic Vestigial Empire, was hiring a lot of barbarians, because its own army was depleted. They even hired the Huns at one point to take down the Burgundians. The Huns quickly figured out there was a lot more gold where their paycheck came from, and spent several years shaking down the Eastern Roman Empire, who had fairly unprofessional soldiers. Then Attila the Hun got cocky and took on the West. The West had trained soldiers and every Barbarian Tribe that Attila had ever wronged on their side. Not surprisingly, Rome won, and Attila died on his wedding night (not of a nosebleed as is commonly thought; his heavy drinking caused a hemorrhage in his esophagus, and killed him with a combination of choking on his own blood and shock) Now here's where Rome made a huge mistake: it let its Western army slack off, and discriminated heavily on the barbarians. Then, the barbarians all teamed up to form The Horde and carried out what is still considered to be the greatest ever Rape, Pillage, and Burn ever conducted. The raid was so devastating that not only were barbarians all over Europe able to reclaim their land while the Romans just stood there staring at the bonfire they used to call 'home', but they actually destroyed 400 years worth of technology. Dark Age Europe ensued.
- Rome did it for centuries: for their neighbouring Germans, serving in the Roman army was a way to get honour (as they knew that surviving the training meant you were a badass) and improving living conditions for themselves and their families upon discharge (they were allowed to settle inside the borders and got citizenship for themselves and their children). The difference was how it was done: for most of the time, the barbarians were split up and sent to serve inside units raised from fully Romanized populations, thus isolating potential troublemakers and expose them to Roman values until they adopted them. Sadly a series of civil wars and a major military campaign after emperor Valentinian III's death ended up depleting the Western army, with general Ricimer (commander in chief of the army and, by then, the real power behind the throne) opting to not have the veterans train new recruits raised from inside the empire but to have barbarian tribes replace the destroyed armies. As soon as that was done, Rome lost Spain, Africa and Gaul to the barbarians for good, and the empire in Italy would soon fall to the barbarians in the army deciding they're better off without an emperor.
- The elite Janissary forces of the old Ottoman Empire, later becoming a powerful military caste in their own right, began technically as Battle Thralls, mainly from the then newly-conquered territories such as Greece and Bulgaria. The Ottomans would acquire suitable young boys for the Sultan from those territories specifically for this purpose, making it also a Real Life case of TykeBombs.
- Well, almost a real life case of Tyke Bombs. They were taken back to Istanbul and given extensive training (in reading, history and religion as well as fighting), so it would sometimes be years before they'd see actual battle.
- The Egyptian Mamluks had a similar origin as the Janissaries, though they eventually took over the country and ruled it until being conquered by said Ottomans.
- The reason why the Mongols could show up in great numbers and plow through Muslim and Christian nations (nobody expected the Mongol horde!) is because they made battle thralls out of every tribe they conquered along the way. And it was a long, long way.
- The British Empire was largely built on Defeat Means Friendship, with the Scots, Sikhs and Gurkhas among their most elite troops.