# 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/)