What does Grand Duchy of Finland do in AoE3?

Dragoon: becomes available; Schiavone: becomes available; Barracks: can train Schiavone; Blockhouse: can train Schiavone. The game says: "Enables Russian Counter Dragoons (improved Dragoons) and Counter Jaegers (Schiavone-like infantry) for training in Stables and Barracks or Blockhouses respectively."

Home City card

Grand Duchy of Finland

Grand Duchy of Finland (tech ID DEHCREVFinnishCounterArmy) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 2 civilizations, sent from the Fortress Age. Effect: Dragoon: becomes available; Schiavone: becomes available; Barracks: can train Schiavone; Blockhouse: can train Schiavone.

Quick answers (3)

Which civilizations have the Grand Duchy of Finland card?: Russians and Swedes.
What does Grand Duchy of Finland do in AoE3?: Dragoon: becomes available; Schiavone: becomes available; Barracks: can train Schiavone; Blockhouse: can train Schiavone. The game says: "Enables Russian Counter Dragoons (improved Dragoons) and Counter Jaegers (Schiavone-like infantry) for training in Stables and Barracks or Blockhouses respectively."
What is the tech ID of Grand Duchy of Finland?: DEHCREVFinnishCounterArmy.

Enables Russian Counter Dragoons (improved Dragoons) and Counter Jaegers (Schiavone-like infantry) for training in Stables and Barracks or Blockhouses respectively.

What it does

Dragoon: becomes available
Schiavone: becomes available
Barracks: can train Schiavone
Blockhouse: can train Schiavone
Galleon: can train Schiavone
Fort: can train Schiavone

Cost: 5001
Sent from: III
Times it can be sent: 1
Game ID: DEHCREVFinnishCounterArmy

In these decks

RussiansIII×1

SwedesIII×1

Source: techtreey.xml and the Home City files, AoE3: DE 100.19.18309 (build 25040513).