UK & Ireland · Elevated Stronghold
Edinburgh Castle
United Kingdom
Edinburgh Castle is strongest on Defensibility 8/10 — A steep volcanic rock, layered wards, batteries, drawbridge/dry ditch, guardhouse, inner barriers and portcullis provide very strong defense in depth and fallback. The large historic complex and modern public access prevent exceptional 9-class confidence.. Its clearest scored constraint is Isolation 0/10 — The fortress is explicitly at the heart of Edinburgh's Old Town, only a short walk from major rail/tram connections. Castle Rock improves local defense but not regional isolation..
Overall
5 out of 10Defensibility
8 out of 10Isolation
0 out of 10Sustainability
7 out of 10Ranking context
How this base ranks
Global
#33 of 91 · Top 36.26%
Region · UK & Ireland
#7 of 11 · Top 63.64%
Base Type · Elevated Stronghold
#2 of 13 · Top 15.38%
Field assessment
At a glance
Bottom Line
For the fixed 20-person Base boundary, the most important endurance constraint is Resource Security 3/10 — The castle has current food/drink service, working water-dependent facilities and pipework, plus a deep historic well and storage-tank system physically within the fortress. Those are significant starting resources, but current independent well potability/yield, protected usable storage, durable food replenishment and survival-energy continuity are not established outside Edinburgh's utility/logistics network. This fits useful starting resources with major dependencies..
Biggest Trade-off
The central trade-off is the catalogue's strongest evidenced dimension, Defensibility at 8/10, against its weakest evidenced dimension, Isolation at 0/10.
Most Likely Failure
The evaluation leaves this material failure condition unresolved: Current water distribution and deep historic well/storage infrastructure are real, but present independent potable yield, treatment and outage continuity are not established. Resource Security 3 credits the evidenced starting position while retaining this limitation for package adjudication.
Score rationale
Why it scores this way
Defensibility · 8/10
A steep volcanic rock, layered wards, batteries, drawbridge/dry ditch, guardhouse, inner barriers and portcullis provide very strong defense in depth and fallback. The large historic complex and modern public access prevent exceptional 9-class confidence.
Advantages
- Positive credit is limited to what supports the Defensibility score of 8/10; the component rationale is: A steep volcanic rock, layered wards, batteries, drawbridge/dry ditch, guardhouse, inner barriers and portcullis provide very strong defense in depth and fallback. The large historic complex and modern public access prevent exceptional 9-class confidence.
Limitations
- Do not infer additional Defensibility capability outside the fixed Base boundary or beyond the recorded evidence.
Isolation · 0/10
The fortress is explicitly at the heart of Edinburgh's Old Town, only a short walk from major rail/tram connections. Castle Rock improves local defense but not regional isolation.
Advantages
- Positive credit is limited to what supports the Isolation score of 0/10; the component rationale is: The fortress is explicitly at the heart of Edinburgh's Old Town, only a short walk from major rail/tram connections. Castle Rock improves local defense but not regional isolation.
Limitations
- Do not infer additional Isolation capability outside the fixed Base boundary or beyond the recorded evidence.
Sustainability · 7/10
The active complex contains barracks/residential-grade historic buildings, former hospital/storehouses, current toilets, cafés and multiple enclosed functional spaces. Twenty people have strong year-round habitat options despite an exposed hilltop climate and dependence on city utilities.
Advantages
- Positive credit is limited to what supports the Sustainability score of 7/10; the component rationale is: The active complex contains barracks/residential-grade historic buildings, former hospital/storehouses, current toilets, cafés and multiple enclosed functional spaces. Twenty people have strong year-round habitat options despite an exposed hilltop climate and dependence on city utilities.
Limitations
- Do not infer additional Sustainability capability outside the fixed Base boundary or beyond the recorded evidence.
Survival horizons
How survival changes over time
First 7 days: current defence/contact profile
First 7 Days
This horizon does not invent future upgrades or resupply. It carries the current evaluated conditions forward and keeps unknown future capability uncredited.
Positive factors
- The stronger current condition in this horizon is Defensibility 8/10 — A steep volcanic rock, layered wards, batteries, drawbridge/dry ditch, guardhouse, inner barriers and portcullis provide very strong defense in depth and fallback. The large historic complex and modern public access prevent exceptional 9-class confidence..
Risks
- The weaker current condition in this horizon is Defensibility 8/10 — A steep volcanic rock, layered wards, batteries, drawbridge/dry ditch, guardhouse, inner barriers and portcullis provide very strong defense in depth and fallback. The large historic complex and modern public access prevent exceptional 9-class confidence.; no better future state is assumed.
First 100 days: current habitat/capacity profile
First 100 Days
This horizon does not invent future upgrades or resupply. It carries the current evaluated conditions forward and keeps unknown future capability uncredited.
Positive factors
- The stronger current condition in this horizon is Population Capacity 8/10 — A six-storey New Barracks, Governor's House, former hospital/storehouses, halls and multiple wards give substantial support-space headroom beyond twenty people. Current large-scale visitor operation further demonstrates circulation and sanitation throughput..
Risks
- The weaker current condition in this horizon is Sustainability 7/10 — The active complex contains barracks/residential-grade historic buildings, former hospital/storehouses, current toilets, cafés and multiple enclosed functional spaces. Twenty people have strong year-round habitat options despite an exposed hilltop climate and dependence on city utilities.; no better future state is assumed.
Long term: current resource/maintenance profile
Long Term
This horizon does not invent future upgrades or resupply. It carries the current evaluated conditions forward and keeps unknown future capability uncredited.
Positive factors
- The stronger current condition in this horizon is Maintenance Resilience 5/10 — Rock, walls and defensive geometry are largely passive, and the complex contains many robust masonry buildings. Current habitation/sanitation and heritage safety rely on maintained city infrastructure and specialist conservation, so capability would degrade in stages rather than remain fully independent..
Risks
- The weaker current condition in this horizon is Resource Security 3/10 — The castle has current food/drink service, working water-dependent facilities and pipework, plus a deep historic well and storage-tank system physically within the fortress. Those are significant starting resources, but current independent well potability/yield, protected usable storage, durable food replenishment and survival-energy continuity are not established outside Edinburgh's utility/logistics network. This fits useful starting resources with major dependencies.; no better future state is assumed.
Tactical assessment
Practical Reality
Reality Check
Scores apply only to the defined Base and exactly 20 capable adults. Unknown, excluded or external assets are not credited as hidden capability.
Best Use
Within the evaluated boundary, treat Defensibility as the primary operational strength; do not promote that score into capabilities the evidence does not establish.
Key Risk
Resource Security is the key evidenced long-duration risk: The castle has current food/drink service, working water-dependent facilities and pipework, plus a deep historic well and storage-tank system physically within the fortress. Those are significant starting resources, but current independent well potability/yield, protected usable storage, durable food replenishment and survival-energy continuity are not established outside Edinburgh's utility/logistics network. This fits useful starting resources with major dependencies.
Strengths
- One of the strongest scored dimensions is Defensibility 8/10 — A steep volcanic rock, layered wards, batteries, drawbridge/dry ditch, guardhouse, inner barriers and portcullis provide very strong defense in depth and fallback. The large historic complex and modern public access prevent exceptional 9-class confidence..
- One of the strongest scored dimensions is Exposure Control 8/10 — Castle Rock's steep sides and the principal Esplanade-drawbridge-gate sequence strongly funnel most ground approaches with excellent elevated observation. Some historic/modern secondary access and the dense city below keep it below exceptional..
- One of the strongest scored dimensions is Population Capacity 8/10 — A six-storey New Barracks, Governor's House, former hospital/storehouses, halls and multiple wards give substantial support-space headroom beyond twenty people. Current large-scale visitor operation further demonstrates circulation and sanitation throughput..
Weaknesses
- One of the weakest scored dimensions is Isolation 0/10 — The fortress is explicitly at the heart of Edinburgh's Old Town, only a short walk from major rail/tram connections. Castle Rock improves local defense but not regional isolation..
- One of the weakest scored dimensions is Resource Security 3/10 — The castle has current food/drink service, working water-dependent facilities and pipework, plus a deep historic well and storage-tank system physically within the fortress. Those are significant starting resources, but current independent well potability/yield, protected usable storage, durable food replenishment and survival-energy continuity are not established outside Edinburgh's utility/logistics network. This fits useful starting resources with major dependencies..
- One of the weakest scored dimensions is Maintenance Resilience 5/10 — Rock, walls and defensive geometry are largely passive, and the complex contains many robust masonry buildings. Current habitation/sanitation and heritage safety rely on maintained city infrastructure and specialist conservation, so capability would degrade in stages rather than remain fully independent..
Assumptions / constraints
- Only assets inside the recorded Core Base and immediate operating boundary are credited; excluded surroundings and unproven future access remain outside the score.
Decision context
Rivals / Alternatives
Similar rival
Caerphilly Castle
United Kingdom · Fortified Structure
Caerphilly Castle keeps the same UK & Ireland risk context, with only 0.3 points between the overall scores and closely matched isolation pressure.
Overall 5.3/10
Strongest alternative
Fort George
United Kingdom · Fortified Structure
Fort George scores 6.7 overall versus 5.0, adding a stronger isolation profile while staying relevant as a UK & Ireland option.
Overall 6.7/10
Wildcard rival
Waw an Namus Caldera
Libya · Subterranean
Waw an Namus Caldera changes the strategy: it is a subterranean with a isolation edge, while Edinburgh Castle holds more of the defensibility advantage.
Overall 4.3/10