This guide was made by Buster WolfBuster Wolf.

This guide will list how to unlock every event in Samurai Warriors 4: Empires.

Territorial

Event Name Requirement
Taming the Chaos Start a playthrough with the Ambition of Uniting the land.
First Step Start a playthrough that doesn't have the Ambition of Uniting the land.
A Land United Complete the Ambition of Uniting the land.
A Dream Realized Complete an Ambition that isn't Uniting the land.
Expanding Lands Have at least 10 castles.
A Mighty Force Have at least 20 castles.
First Encounter Invade or Defend for the first time.
Final Battle Invade the final territory to unite the land, Uniting the Land must be the Ambition.

Historical

Event Name Requirement Notes
Warm Sandals Have at least 3 castles. Triggers during Winter.
The Three Arrows - Unbroken Have Takakage Kobayakawa, Hisahide Matsunaga, Motonari Mōri, Kanetsugu Naoe, Magoichi Saika, Shingen Takeda or Ieyasu Tokugawa in your clan.
The Three Arrows - Broken Same as The Three Arrows - Unbroken with different officers used.
If the Nightingale Won't Sing… Have at least 15 officers in your clan, 2 officers must be friends with each other.
Keiji's Cold Bath - Deceived Keiji Maeda must be in your clan, have at least 10 officers. Doesn't trigger with female officers.
Keiji's Cold Bath - Avoided Keiji Maeda must be in your clan, have at least 25 officers. Doesn't trigger with female officers.
Sending Salt to the Enemy Win a battle against an enemy clan who doesn't have contact with the sea.
Duel Have 2 of the following officers in your clan. Musashi Miyamoto, Kojirō Sasaki, Munenori Yagyū while having one of them as a friend. Yoshiteru Ashikaga, Ittōsai Itō, Nobutsuna Kamiizumi, Tomonori Kitabatake, Shigekata Tōgō, Bokuden Tsukahara and Munetoshi Yagyū also work.
Unworthy Have a Tier 3 castle with the Daimyō having retainer relationships. Triggers on famous officers, created characters of yours and created females from the game.
People Have at least 25 officers in the clan, magistrates must be placed.
Long into the Night Have at least a Tier 2 castle, magistrates must be place (either in all rooms or just 2 in the diplomacy room), a castle of yours must have multiple other clan castles with 5,000 or more troop difference near it. My findings
Clear Vision - Toyotomi Clan In the Incident of Honnōji Scenario pick Hideyoshi Toyotomi as the Daimyō.
Clear Vision - Other Clans In the Incident of Honnōji Scenario pick Ieyasu Tokugawa or Katsuie Shibata as the Daimyō.
Howling at the Moon Recruit a female officer after her previous clan has been erased from history. This means having Aya after the Uesugi are gone, Kai after the Hōjō are gone etc.
Reminder Win a defensive battle in which allies were defeated more than once.
The Short Sword Have 2 officers as sworn allies after the 28th turn of the scenario.
Four Proud Warriors With Yoshihisa Shimazu as the Daimyō have Yoshihiro Shimazu, Toshihisa Shimazu & Iehisa Shimazu in the clan together. Any scenario excluding Kawanakajima will get this event.
Sumo Have at least 10 castles with 2 male officers as friends or sworn allies.
The Challenge Have Masanori Fukushima in your clan for at least 10 turns, he must have a friend and not be placed as a magistrate. I tried forcing this event by having someone as Masanoris friend with him as a magistrate and it never popped up, when I tried with him not a magistrate with a friend it worked.
Budgeting Lessons Have less gold than what you started with after the 8th turn while Kanbei Kuroda, Hisahide Matsunaga, Toshiie Maeda, Nobuyuki Sanada or Ieyasu Tokugawa are in your clan. Neither must be the Daimyō.
A Leader's Concern Have 50 or more officers in your clan with Kanbei Kuroda, Yoshihiro Shimazu, Muneshige Tachibana or Takatora Tōdō in the personnel room.
Three Party Talks Have 2 active alliances at the same time after the 4th turn of the scenario.
Proud Owners Have at least 35 officers while 2 characters are friends or sworn allies.
Sorcery - Frightened Have at least 5 castles. Triggers during Summer.
Sorcery - Unperturbed Have at least 10 castles with Hanzō Hattori, Nobunaga Oda, Okuni, Yoshitsugu Ōtani, Sakon Shima, Yoshihiro Shimazu, Takatora Tōdō or Munenori Yagyū in your clan.
Kindness Have at least 30 officers with the Daimyō having a close friend in their clan. Nobunaga with Katsuie, Ieyasu with Munenori, etc.
Surprise Have at least 25 officers with Masamune Date as the Daimyō while having magistrates who do not own a horse. Triggers during Autumn.
Overcoming the Odds Have 12 or more castles with Masanori Fukushima, Naomasa Ii, Naotora Ii, Kai, Toshiie Maeda, Yukimura Sanada or Toyohisa Shimazu are in the clan.
Benevolence Have one of your territories experience a poor crop.
Parade in the Capital Ambition must be Uniting the land, must have at least 17 castles with Nijō Palace being one of them, Rank must be Senior Fifth Rank, Lower Grade Protector of Yamato or higher and the Daimyō plus another officer must have a horse. Happens at the beginning of a turn.
Imperial Approval After Parade in the Capital pick the Daimyō during the Politics Phase.
Inspiring the Men Construct a Tier 2 castle with at least 3 officers in the clan.
Secret of a Master Builder Construct a Tier 3 castle with Ujiyasu Hōjō, Kiyomasa Katō, Kanbei Kuroda, Hisahide Matsunaga or Takatora Tōdō are in your clan.
Growth Construct a Tier 4 castle with at least 3 officers in the clan.
A Life Saved Invade during Autumn with Yoshimoto Imagawa, Kojūrō Katakura, Hisahide Matsunaga, Keiji Maeda or Shingen Takeda are in your clan and present for the battle. Must be from your clan not a coalition.
Augury Have at least a Tier 3 Castle and begin a battle with Kojūrō Katakura, Kanbei Kuroda, or Hanbei Takenaka as the strategist during Spring with them participating in the battle. Has a low trigger chance and can possibly get the one below.
Augury - Ill Omens Same as Augury with a different ending.
No Thanks Needed Have at least 20 castles and win a battle against a force with 1,500 more troop strength with an officer who has a retainer relationship with the Daimyō They don't need to be one of the Four Guardians should you have it ready, also the Daimyō doesn't need to participate in the battle.
Secret Springs - Tōhoku-Hokuriku Win a battle during Winter in the Hokuriku region using an officer who is a sworn ally or spouse of Mitsuhide Akechi, Aya, Masamune Date, Kojūrō Katakura, Kanetsugu Naoe, Katsuie Shibata, Kagekatsu Uesugi, Kenshin Uesugi or Munenori Yagyū. Both must be present for the battle one of them under your control. The Hokuriku region is Mt. Kasuga Castle, Nanao Castle & Ichijōdani Castle.
Secret Springs - Kantō Win a battle during Winter in the Kantō region using an officer who is a sworn ally or spouse of Ujiyasu Hōjō, Ina, Kai, Lady Hayakawa, Toshiie Maeda, Yoshitsugu Ōtani or Nobuyuki Sanada. Both must be present for the battle one of them under your control. The Kantō region is Minowa Castle, Utsunomiya Castle, Ōta Castle, Iwatsuki Castle, Odawara Castle & Kururi Castle.
Secret Springs - Chūbu Win a battle during Winter in the Chūbu region using an officer who is a sworn ally or spouse of Masanori Fukushima, Kotarō Fūma, Tadakatsu Honda, Naotora Ii, Yoshimoto Imagawa, Kunoichi, Keiji Maeda, Nobunaga Oda, Yukimura Sanada, Shingen Takeda or Ieyasu Tokugawa. Both must be present for the battle one of them under your control. The Chūbu region is Mt. Inaba Castle, Kiyosu Castle, Okazaki Castle, Sunpu Manor.
Secret Springs - Kinki Win a battle during Winter in the Kinki region using an officer who is a sworn ally or spouse of Nagamasa Azai, Gracia, Hanzō Hattori, Naomasa Ii, Mitsunari Ishida, Goemon Ishikawa, Hisahide Matsunaga, Nene, Oichi, Magoichi Saika, Sakon Shima, Hanbei Takenaka or Hideyoshi Toyotomi. Both must be present for the battle one of them under your control. The Kinki region is Himeji Castle, Yakami Castle, Odani Castle, Nijō Palace, Kishiwada Castle, Tsutsui Castle & Saika Castle.
Secret Springs - Chūgoku-Shikoku Win a battle during Winter in the Shikoku region using an officer who is a sworn ally or spouse of Motochika Chōsokabe, Takakage Kobayakawa, Koshōshō, Kanbei Kuroda, Motonari Mōri, Ranmaru Mori, Okuni or Takatora Tōdō. Both must be present for the battle one of them under your control. The Shikoku region is Yuzuki Castle, Sogō Castle, Nakamura Castle & Okō Castle.
Secret Springs - Kyūshū Win a battle during Winter in the Kyūshū region using an officer who is a sworn ally or spouse of Kiyomasa Katō, Musashi Miyamoto, Kojirō Sasaki, Toyohisa Shimazu, Yoshihiro Shimazu, Ginchiyo Tachibana or Muneshige Tachibana. Both must be present for the battle one of them under your control. The Kyūshū region is Muranaka Castle, Hitoyoshi Castle, Sadowara Castle & Uchi Castle.
Secret Springs - Lost Win a battle during Winter in the incorrect region for any of the above mentioned characters. This can also happen if you win in their correct region a second time during Winter after getting the Secret Spring of the region.
A Leader's Words Have at least 6 castles and win a defensive battle while Mitsuhide Akechi, Nagamasa Azai, Gracia, Naotora Ii, Takakage Kobayakawa, Lady Hayakawa, Nene, Oichi, Okuni or Yoshitsugu Ōtani are the Daimyō where allied officers are defeated more than once.
The Heart's True Desire Win a battle where a characters rank becomes Advisor.
Suggestion Box Have a Tier 3 castle and use Honor court or Proselytize.
Thinking of the People Have a Tier 3 castle while having high Rice Yield in one of your territories.
Behind Every Great Man… Have a married couple where the male doesn't have a horse.
Tireless Training Have a female officer in the Military room on a Tier 3+ Castle. Doesn't trigger on or with male characters.

Battle

These are special cutscenes that will only occur during Conquest Mode if the right conditions are met. Also the required characters must not be replaced for the event to occur.
Event Name Requirement Scenario(s)
Battle of Okehazama In the Battle of Okehazama Scenario pick Nobunaga Oda as the Daimyō. Okehazama.
Fourth Battle of Kawanakajima Have Shingen Takeda or Kenshin Uesugi as the Daimyō invade or be invaded by the other with both present for the battle. Kawanakajima or Okehazama.
Battle of Anegawa With Nobunaga Oda or Nagamasa Azai as the Daimyō invade or be invaded by the other with both present for the battle. Okehazama.
Battle of Mikatagahara With Shingen Takeda as the Daimyō invade Ieyasu with both present for the battle. Kawanakajima or Okehazama.
Battle of Nagashino With Nobunaga Oda or Katsuyori Takeda as the Daimyō invade or be invaded by the other with both present for the battle. Nagashino.
Incident at Honnōji In the Incident of Honnōji Scenario pick Mitsuhide Akechi as the Daimyō. Honnōji.
Battle of Yamazaki With Mitsuhide Akechi or Hideyoshi Toyotomi as the Daimyō invade or be invaded by the other with both present for the battle. Honnōji.
Battle of Shizugatake With Hideyoshi Toyotomi or Katsuie Shibata as the Daimyō invade or be invaded by the other with both present for the battle. Honnōji.
Battle of Komaki-Nagakute With Hideyoshi Toyotomi or Ieyasu Tokugawa as the Daimyō invade or be invaded by the other with both present for the battle. Honnōji or Odawara.
Battle of Sekigahara With Ieyasu Tokugawa or Mitsunari Ishida as the Daimyō invade or be invaded by the other with both present for the battle. Sekigahara.
Battle of Odawara Castle Invade Odawara Castle while Ujiyasu Hōjō is the Daimyō. Kawanakajima or Okehazama.
Second Battle of Gassan-Toda Castle With Motonari Mōri as the Daimyō invade Haruhisa Amago with Shikanosuke Yamanaka in the Amago clan. Motonari and Shikanosuke must be present in the battle. Okehazama.
Battle of Mt. Inaba Castle Invade Mino-Hida while Yoshitatsu Saitō is the Daimyō. Okehazama.
Battle of Mimase Pass With Ujiyasu Hōjō as the Daimyō invade Shingen Takeda with both present for the battle. Kawanakajima or Okehazama.
Battle of Shimanto River With Motochika Chōsokabe as the Daimyō invade Kanesada Ichijō with both present for the battle. Okehazama.
Battle of Tetorigawa With Nobunaga Oda or Kenshin Uesugi as the Daimyō invade or be invaded by the other with both present for the battle. Kawanakajima, Okehazama or Nagashino.
Battle of Mimigawa With Sōrin Ōtomo or Yoshihisa Shimazu as the Daimyō invade or be invaded by the other with both present for the battle. Okehazama, Nagashino or Honnōji.
First Battle of Ueda Castle Invade Utsunomiya Castle while Masayuki Sanada is the Daimyō. Honnōji or Odawara.
Battle of Hitotori Bridge With Masamune Date or Yoshishige Satake as the Daimyō invade or be invaded by the other with both present for the battle. Odawra or Sekigahara.
Battle of Hetsugigawa With Motochika Chōsokabe as the Daimyō invade Yoshihisa Shimazu Takeda with both present for the battle. Okehazama, Nagashino, Honnōji, Odawara or Sekigahara.
Battle of Hasedō With Masamune Date or Kagekatsu Uesugi as the Daimyō invade or be invaded by the other with both present for the battle. Odawara or Sekigahara.

Human Relations

Event Name Requirement
A Budding Friendship Have 2 officers within the same room often or use Fraternize on two officers for a potential friendship, also send them to battle together and keep them near each other.
Firm Friends After A Budding Friendship on 2 officers of the same gender send both officers to battle together.
Confession After A Budding Friendship on 2 officers of different genders send them both to battle together eventually triggering a battle objective and complete their battle objective.
Wedding Day After Confession choose one of the 2 officers during the Politics Phase to get this event.
Deepening Bonds 2 officers that are friends must be continuously sent to battle together near each other eventually triggering a battle objective, completing gets this event after the battle.
Oath After Deepening Bonds this will be given in the Politics Phase from one of the 2 officers making them Sworn Allies.
Respect Send 2 officers who aren't friends and aren't in the same room to battle, keep them away from each other and defeat multiple officers and troops to get this event.
Worthy Rivals After Respect the 2 officers must be sent to battle together eventually triggering a battle objective, completing gets this event after the battle.
A Valued Enemy During battle defeat multiple enemy officers with a Musou attack including the commander to trigger this event after the battle, in a defense battle you don't have to defeat the commander which can still trigger this.
The Highest Regard After A Valued Rival send the officer who has a Nemesis relationship with the enemy commander to battle and complete the battle objective to defeat the commander with a Musou attack.
Proving Oneself Use the Instruct command between 2 officers and have them both sent to battle together.
Master and Protégé After Proving Oneself send the 2 officers who have a Master and Protégé relationship to battle together eventually triggering a battle objective.
Great Expectations Send the Daimyō and officer to battle together near each other often.
Devotion After Great Expectations send the Daimyō and potential retainer to battle together and complete the battle objective.
The Four Guardians Once the Daimyō has 4 retainers make them the Four Guardians.
Common Interest - Academia Construct the Tier 4 castle with a Study.
Common Interest - Martial Arts Construct the Tier 4 castle with a Dōjō.
Common Interest - Tea Ceremony Construct the Tier 4 castle with a Tea Room.
Common Interest - Strategy Construct the Tier 4 castle with a Strategy Room.
Common Interest - Foreign Culture Construct the Tier 4 castle with a Western Room.

Other

Event Name Requirement
Conquest Mode Start Conquest Mode for the very first time.
Credits Complete an Ambition.