Where to Recruit Units
(Current as of release of version .95)
Units recruited at a lower level castle or building are also recruitable at higher levels and so I've listed them at the first recruitable level.
If an (SJ) is by the unit then you need the Sengoku Jidai DLC to use those units. If an (S&H) is by the unit you need the saints and heroes DLC to use those units.
'Saints and Heroes' DLC units
Special units: Date Masamune (Starting Daimyo) and Katakura Kojuro(Starting general) are Teppo Taisho units(Date). Having a ranged attack as well as melee capability. Other generals are Yari Taisho armed with Spears.
Fort: Ashigaru Kashira, Bow Ashigaru, Yari Ashigaru, Katana Ashigaru, Teppo Ashigaru, Light cavalry(Li), Long Yari Ashigaru(SJ), Yumi-Naginata Ashigaru(Kuroda)
Stronghold: Yumi-Naginata Ashigaru, Naginata Ashigaru
Coastal Trails Katana Ronin
Coastal Roads Yari Ronin
Mountain Trails Bow Ronin
Mountain Roads Naginata Ronin
Sake Den
Ninja Colony Kanabo Oni Thugs
Ninja Barracks Kisho Ninja, Sanada Juyushi(Sanada max 1)
Grenade Maker Kage Ninja(S&H)
Embassies
Tokugawa Enables recruitment of Dairinin Agent
Toyotomi Enables recruitment of Dairinin Agent
Gunpowder Magazine Matchlock Samurai, Ashigaru Sharpshooters
Gunsmith Fire Bomb Throwers
Shooting Range Samurai Snipers, Fire Rockets, Matchlock Bandits
Arsenal Hand Mortars (SJ), Heavy gunners (SJ), Tanegashima Samurai (S&H)
Cannon Workshop European Cannons, Fire Projecting Mangonels
Artillery Range Mobile Cannons
Cannon Arsenal Komo Morutaru
Mountain Hermitage Naginata Warrior Monks, Bow Warrior Monks
Temple Complex Naginata Warrior Monk Cavalry
Fortified Monastery Matchlock Warrior Monks
Legendary Monastery Naginata Warrior Monk Hero
Sword School Katana Samurai
Kenjutsu Dojo Katana Wako, Nodachi Samurai
Master Kenjutsu Dojo Tachi Guard
Legendary Kenjutsu Ryuha Katana Hero, Miyamoto Musashi(Ukita), Sasaki Kojiro(Higo-no-Kato), Nodachi Hero (S&H), Tetsubo Samurai (S&H)
Yari Drill Yard Yari Samurai
Naginata Dojo Naginata Samurai
Master Sojutsu Dojo Bulletproof Samurai(SJ), Nagimaka Samurai(S&H)
Legendary Sojutsu Ryuha Yari Hero, Onna Bushi Heroine(S&H)
Grand Sojutsu Dojo
Yumi Dojo Bow Samurai
Archery Range Bandits(SJ), Daikyu Samurai(SJ)
Master Kyudo Dojo Hankyu Samurai
Legendary Kyudo Dojo Bow Hero
Grand Kyudo Dojo
Stables Light Cavalry, Bow Cavalry
Warhorse Stables Yari Cavalry, Katana Cavalry, Nagamaki Cavalry, Naginata Cavalry, Chidori Cavalry, Tachi Cavalry, Nagae Cavalry
Master Bajutsu Dojo Fire Cavalry(SJ), Mounted Gunners(SJ), Shizugatake Cavalry (S&H--Can only be recruited by the Iyo-Kato, Higo-Kato, Fukushima and Kasuya clans)
Legendary Bajutsu Ryuha Yellow Guard, Red Guard, Golden Guard, Yabusame Cavalry(S&H), Tora Cavalry (S&H), Ogoban Cavalry
Coastal Village
Harbour Trade Ship, Bow Kobaya
Trading Port
Open Port
Red Seal-Red Seal Ship
Shipwright Bow Kobaya, Medium Bune
Military Port Siege Tower Bune, Sengoku Bune
Drydock Heavy Bune, O Ataka Bune
Island Drydocks Nihon Maru(matchlock equipped)
Cannon Shipwright Matchlock Kobaya
Cannon Port Cannon Bune, Fire Bomb Kobaya
Cannon Drydock European Caravel
Cannon Drydock Chain Portuguese Black Carrack
Naval specialty- warehouses Wako Raiders (SJ), Matchlock Bandits
Naval specialty- pirate lair Bow Wako, Katana Wako
Holy site specialty- Mountain Hermitage Marathon Monks (SJ)
Holy site specialty- Pilgrim Hostel Warrior Nuns
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Most of this information came from the .pack files and won't necessarily show up correctly in game or I may have read it wrong. If you can verify something is different in Game then let me know or bring it up in the bugs and technical help section.