What does Advanced Mill do in AoE3?

Ships 1 Mill Wagon; Mill: Wood cost −50%, hit points +100%; Ships 1 Uhlan. The game says: "Ships 1 Mill Wagon. Mills are cheaper and stronger."

Home City card

Advanced Mill

Advanced Mill (tech ID HCAdvancedMillGerman) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Discovery Age. Effect: Ships 1 Mill Wagon; Mill: Wood cost −50%, hit points +100%; Ships 1 Uhlan.

Quick answers (3)

Which civilizations have the Advanced Mill card?: Germans.
What does Advanced Mill do in AoE3?: Ships 1 Mill Wagon; Mill: Wood cost −50%, hit points +100%; Ships 1 Uhlan. The game says: "Ships 1 Mill Wagon. Mills are cheaper and stronger."
What is the tech ID of Advanced Mill?: HCAdvancedMillGerman.

Ships 1 Mill Wagon. Mills are cheaper and stronger.

What it does

Ships 1 Mill Wagon(unit)
Mill: Wood cost −50%, hit points +100%
Ships 1 Uhlan(unit)

What it hands over

1 × Mill Wagonno train cost

Total ≈ 0 resources — units at their train cost, crates and animals at what they hold.

Cost: 1
Sent from: I
Times it can be sent: 1
Game ID: HCAdvancedMillGerman

In these decks

GermansI×1

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