A Coat of Steel is designed primarily around 25–28mm miniatures, though the Captain explicitly states that other scales may be used just as easily. The game assumes armies are organized with “bands” mounted on equal-width bases (a unit), with companies generally ranging between 6 and 16 stands. The rules reward armies with historically organized retinues rather than optimized tournament-style builds. ​

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You will need:

• Two Wars of the Roses armies, ideally with mixed retinues of billmen, archers, and men-at-arms.

• A deck of the game’s Resolution Cards.

• Ward activation chits and tactical counters.

• Commander cards and Courage markers.

• A reasonably large table with terrain suitable for English medieval battles.

• The companion campaign system A Crown of Paper is optional, but strongly encouraged since the two systems were clearly designed together.

HOW IT PLAYS

Before battle even begins, players organize their hosts into historical wards and companies, assigning commanders whose personalities and political loyalties directly affect performance. Each ward receives an “Overall Order” before the game starts — plans such as Grim Advance, Await the Foe, or Headlong Rush. These determine which tactical options the ward may later employ during battle. Once the battle begins, players activate wards randomly using chit draws, creating uncertainty and coordination problems that feel very appropriate for the era.

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Movement and attacks are heavily tied to formation discipline and momentum. A rapid advance may generate a devastating quick assault, but if the ward hesitates or becomes disordered, its attacks degrade into tired or piecemeal assaults. Terrain, obstacles, weather, and morale all interfere with command efficiency. Archery is especially distinctive. Long-range “Flight” shooting and short-range “Sheaf” volleys function differently, representing the historical use of lighter and heavier arrows. Given the central role of bowmen in the Wars of the Roses, this historical distinction is a welcome addition, and one rarely seen in other medieval game systems. Handstrokes (close combat) uses card-driven tactical comparisons rather than simple dice attrition, emphasizing momentum, fatigue, and cohesion over straightforward casualty counting.

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Among loyal players, one of the game’s most praised elements is the way it forces a player to commit to a plan. Not only do Wards commit to an overall order before the game begins, activation throughout the battle requires a player to select tactical orders from a pool of options and implement them. The inability to radically alter plans mid-game may frustrate some players, but the reward is a rare kind of historical flavor. All of these fascinating mechanics and period flavor do come with some drawbacks. A Coat of Steel employs a substantial number of counters, markers, and command aids. Setup can be lengthy, and the rules are as intimidating to read as Hoplomachia. It's a 40-page Word document that requires at least two readings to fully grasp--not because the rules are poorly written, but because there's a lot happening in A Coat of Steel. 

FINAL Note

A Coat of Steel is not a casual medieval ruleset for beginners. It is dense, highly thematic, and devoted to simulating the politics and battlefield friction of the Wars of the Roses. Players looking for a fast pick-up game should look elsewhere, but for gamers who want a system that genuinely feels like a late medieval English battle — with wavering nobles, collapsing morale, arrow storms, feints, betrayals, and exhausted retinues grinding forward under heraldic banners — A Coat of Steel stands out as one of the most distinctive free systems ever published and worthy of our Hidden Gem badge. The campaign system, A Crown of Paper, is itself a crowning achievement.