Whether hostile to each other, indifferent, or strangers, different groups must fight on the same side. All the way up to an Enemy Mine situation. Afterwards, they are no longer hostile and perhaps even actual friends. If they continue as enemies, they are Friendly Enemy.
Bonus points if:
- they save each other's lives in the heat of battle;
- they fight as Back-to-Back Badasses;
- one says It Has Been an Honor;
- one insists that No One Gets Left Behind, or that the other's is a Greater Need Than Mine;
- one gives the other a weapon.
Borderline cases when Redemption Equals Death, since the friendship could have broken up after the fighting ended. Still, expect the survivor to refuse to let the other die alone, and often a Meaningful Funeral or To Absent Friends follows, especially if it involved a long period of time and hiatuses in the actual fighting—a campaign or a war rather than a battle. May occur after Let's You and Him Fight, and lead to Lighthearted Rematch. May also lead to exchanging plot-significant objects, or just an Odd Friendship. In a military situation, when this occurs between a superior and his juniors, may lead to their speaking With Due Respect. When mistrust is manifested after this trope, Remember That You Trust Me often ensues.
Other hazardous or even mere strenuous activities that require mutual assistance, such as The Chase, can also develop a kind of this; the closer it comes to as dangerous as war, like an attempt to escape through a jungle full of man-eating beasts and other dangers, the more it will resemble it.
Overlap with Band of Brothers is considerable, but in this trope, they need never to work together again, and that one, they do not have to be friendly, just reliable.
When these fire-forged friends belong to opposite genders, expect them to take it to the next level.
Truth in Television to a very large extent, as many people who served in any military force can testify, even more so if they are war veterans. Note that if they did not actually fight in the same battles, it's Commonality Connection to learn they were both soldiers.
Contrast Defeat Means Friendship, Kill Me Now, or Forever Stay Your Hand, A Friend in Need, Blood Brothers. Compare Relationship-Salvaging Disaster, where traumatic events keep people who were already friends together.
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- Most BIONICLE characters who become Toa are strangers at the start but become friends or at least trustworthy allies during their adventures and fights. Most notably, Tahu and Kopaka practically couldn't have been more different, and a lot of time was dedicated to their petty disputes, but at the end, Kopaka came to regard Tahu as a leader worthy of respect. The close friendship between Takua/Takanuva and Jaller is also this, as they only got so close during their exploits in the Bohrok Wars. Matoro might be the saddest example — not long after he came to regard his teammates a friends, he had to perform a Heroic Sacrifice.
- The Tres Horny Boys of The Adventure Zone: Balance have this with each other and, to a lesser extent, with their friends in the Bureau. Three strangers who meet in a bar over a one-time job offer become something like a family over the course of several misadventures. This actually occurs twice, thanks to the wiped memories of their pasts. Originally, they were only acquaintanced through the IPRE, but a hundred years of fighting and dying together brought them closer to each other and the other members of the team. When they are all reunited for the final stand against the Hunger, their bonds are as strong as ever.
- Officer Eiffel and Commander Minkowski from Wolf 359 grow into this. Especially impressive when you consider how flagrantly antagonistic their relationship was during the first episodes of the series.
- The Nexus. Originally, they were rookies on WWE's NXT show, and were thus, competing against each other for a WWE contract. However, they all came to loathe WWE management as they forced the rookies to do humiliating challenges like obstacle courses and keg carrying contests, as well as constant rule changes and unchecked abuse from certain WWE pros that were supposed to be mentoring the rookies. This led to the Season 1 winner Wade Barrett uniting all the Season 1 rookies and leading an assault on Monday Night RAW until all
eightseven rookies ended up with contracts.
- One possible backstory for Chaos warbands in Black Crusade: the warriors have survived this long by sticking to each other, and would do anything to keep each other alive. Of course, this being 40K, an equally likely one is each warrior viewing the rest of the warband as walking meatshields until they can be sacrificed to obtain power from the Dark Gods.
- Magic: The Gathering: The original four members of the Gatewatch were four planeswalkers with very different personalities who came together to fight the Eldrazi, only to discover that they made a surprisingly good team. Since the Eldrazi are far from the only threat in the multiverse they decided to form The Team.
- Cyrano de Bergerac wonderfully subverts this: Cyrano and Christians friendship is not born because they fight against the same enemy, but because they are courting The Ace Roxane, from whose rejection both of them are terribly afraid and must gather all their courage only to face her.
- William Shakespeare has Henry V claim this in his Rousing Speech — but he doesn't actually manifest such friendship toward his soldiers after the battle.
- The quote at the top of the page
is exactly the same asalludes to this bit from the St. Crispin's Day speech:Henry V: We few, we happy few, we band of brothers;
For he to-day that sheds his blood with me
Shall be my brother; be he ne'er so vile,
- The quote at the top of the page
- Awful Hospital: Massively subverted right after Fern teams up with Harmburger and BBQ Girll to bring down the Glumdroodler. Then played straight as can be with her companions in the Inert Vessel.
- Bob and George: Don't you just love how needless violence brings people together?
- In Dragon Mango, Bleu Berry and Peaches, against the oni, which is why Bleu Berry decides to confess.
- El Goonish Shive has Susan and Nanase, of all people, becoming friends during the tour to France, though this doesn't mean they're as much as polite with each other. Now that Susan's secret is out, she's even opening up to her.
- Melissa was Justin's delusional Unlucky Childhood Friend a mention of whom he barely could stand, and Elliot was upset on his behalf. They seem to be on normal terms now, and all it took to heal the situation was having Justin find her staring down a dragon that just knocked down Elliot and then being scared by his mind-numbing other Secret Identity together.
- Gunnerkrigg Court, after the space battle.
- Also quite literally (thanks to their fire-based powers) with the two heroines of Chapter 70. An unusual example in that they are two different versions of Annie, thanks to a trick played by Loup.
- The Trolls of Homestuck after completing their session. Although they're not "friendly" so much as "not actively trying to backstab each other."
- Well, the ones that are still alive, anyway.
- Impure Blood: Fight the bad guys together, stick up for him when the ingrates try to arrest him.
- Molly and Galatea in The Inexplicable Adventures of Bob! got off to a very rocky start, but accepted each other as sisters after being chased by a (small) angry mob and the FBI, and getting lost in the woods.
- Vaarsuvius and Blackwing, the elf's familiar, In The Order of the Stick. Blackwing resents being V's familiar, due to V's neglect of him, but when they need to co-operate to destroy Xykon's phylactery, they put aside their differences and develop mutual respect.
- In Our Little Adventure Angelika gets along better with Emily after a fight. Episode title: "Fire forged friends... except with ice."
- Penny and Aggie sees the titular Friendly Enemies become this trope when they join forces against Meg and Karen's increasingly bullying tactics in "The Popsicle War" arc.
- The three main characters of Problem Sleuth, but especially the eponymous Sleuth and Ace Dick, who have an active rivalry going before being forced to team up to escape their respective offices.
- The Power Trio of Brennus met this way, fighting the Snow Queen together.
- Raimi and Oran of Broken Saints are from completely different parts of the world, have completely different outlooks on life, and certainly get off to a rocky start, but by the Grand Finale, it's clear they're destined to be Heterosexual Life-Partners.
- Done on a massive scale in the spoil fanfiction Enemy of My Enemy, where what starts as a tense Enemy Mine situation soon leads to humans & Elites fighting together like brothers. A good example is Flight Officer Perry and Helmsman Zuka.
- From the Global Guardians PBEM Universe: Majestic, a hero team sponsored and sanctioned by the British government, was originally a group of perfect strangers from all parts of the British isles, brought together by the government quickly and with no warning in response to an attack by the subterranean Lemurians. The experience made them a true team. Later, the team would move from this to a true Band of Brothers while fighting off the super-terrorists known as Jihad.
- The Mall Fighters in Mall Fight all ended up as this, one way or another.
- Each team in Red vs. Blue starts off the mortal enemy of the other team, and most people on the same team don't like each other either. As the series progresses, though, they wind up having to help one another through a lot of difficult spots, to the point of coming to each other's rescue.
- A lot of that is because Sarge is The Only One Allowed To Defeat The Blues.
- The titular team of RWBY formed in spite of their own disagreements or distrust of each other. Weiss viewed Ruby as an idiot, Ruby viewed Weiss as a stuck up jerk, Blake was standoffish and Yang was trying to force her sister Ruby to make new friends. Fighting a giant flying monster helped to bring them together a lot, though not completely.
- Ozpin, the principal of Beacon, may be invoking this trope, actually. As the test they were in was meant to form teams, throwing them into a place filled with fearsome beasts that would require teamwork to take down is an efficient way.