Tech Tree
Buildings	Required
Port	Main building: level 5
Market place	Main building: level 5
Barracks	Main building: level 10
Fisherman´s Hut	Main building : level 10 Fishing Rod research: level 5
Laboratory	Main building: level 10
Ironworks	Main building: level 20
Research	Required
Home	Research establishment : level 1
Cancellation of building level	Laboratory : level 1
Fishing rod	Laboratory : level 3
Defense	Laboratory : level 3
Espionage	Laboratory : level 1 Port : level 1
Lance	Laboratory : level 5
Cannon	Laboratory : level 10
Bow	Laboratory : level 10
Sword	Laboratory : level 20
Land units	Required
Foot Soldier	Barracks : level 1
Lancer	Barracks : level 5 Lance research : level 1 Defense research: level 1
Archer	Barracks : level 10 Bow research : level 5 Defense research : level 5
Swordsman	Barracks : level 20 Ironworks : level 1 (unless you get it externally, i.e. you or someone else sends you iron) Defense research: level 10 Sword research: level 10
Sea units	Required
Spy ship	Port : level 5
Merchantman	Port : level 1
Corvette	Main building : level 5 Port : level 5
Frigate	Main building : level 5 Port : level 10
Cruiser	Main building : level 10 Port : level 15 Cannon research: level 5
Dreadnaught	Main building : level 15 Port : level 18 Cannon research: level 10
Outrigger	Main building : level 15 Port : level 10
Small troop transporter	Main building : level 5 Port : level 5
Large troop transporter	Main building : level 5 Port : level 10
Colony vessel	Main building : level 15 Port : level 20 Storage building : level 13

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