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docs/skills/stone-walls.md

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+# Stone Walls
+
+**Entity Type:** Skill
+
+## Properties
+
+| Field | Value |
+|-------|-------|
+| Category | Military |
+| Type | Discovery |
+| Knowledge Cost | 18,000 |
+
+## Description
+
+Stone Walls is a Military skill that unlocks stone-based defensive buildings. These structures provide superior protection compared to wooden palisades, allowing players to fortify their cities against enemy attacks more effectively.
+
+## Effects
+
+Unlocks the following Defensive Buildings:
+
+| Building | Description |
+|----------|-------------|
+| Stone Walls | Walls prevent enemy troops from advancing into your city |
+| Stone Gates | Controls access to the city. The gate will close during an attack |
+| Stone Towers | Archers attack enemies on sight to protect the city |
+
+## Unlock Requirements
+
+- **Knowledge Required:** 18,000
+- **Condition:** Store at least 5t Concrete
+
+This is a Discovery-type skill, which makes up the majority of skills in the Anno 117 skill tree. To research it, you must first reach it via a research path.
+
+## Related Skills
+
+Other skills in the Military category:
+
+- Aegis Research
+- Aux In, Aux Out
+- Axe-Bearers
+- Balearic Ballistics
+- Perilous Ports
+- Encampment Errands
+- Carpe Civitas
+- Cover positions
+- Multi-task Menders
+- Equicurrian Chariots
+- Featherweight Frames
+- Sturdy Construction
+- Plated Hulls
+- Rammed Earth
+- Dominion Research
+- Here Come The Cavalry
+- Imperial Measures
+- Camp Campaigning
+- Cataphractarii
+- Co-ordinated Volleys
+- Legatic Research
+- Legionaries
+- Legionic Research
+- Manipular Manouvres
+- Manor Invictus
+- Nautical Research
+- Ordine Research
+- Parabolics
+- Parmae
+- Rain Of Pain
+- Praetorians
+- Bargain Palisades
+- Pro Domo
+- Provisinal Castra
+- Vitruvius-class Crossbeams
+- Repair Cranes
+- Armousmithing
+- Shipwright Studies
+- Shipboard Scorpiones
+- Protective Entourage
+- Catapult Carriers
+- Navarchal Research
+- Scorpiones
+- Spathas
+- Brick By Brick
+- Another Brick In The Wall
+- Slingers
+- Chariots
+- Sword and Sald
+- Tuatha De Danann
+- Tower Ballistae
+- Tower Contiguity
+- Valetudinaria
+- Cautious Greeting
+- Tacking
+- Target Practice
+
+## Source
+
+- [anno.land - Stone Walls](https://anno.land/en/anno-117-skills/steinmauern/)