What does Cavalry Combat do in AoE3?

Cavalry: hit points +15%, damage +15%; Ships 1 Spanish Treasure Chest. The game says: "All cavalry attack and hitpoints increased."

Home City card

Cavalry Combat

Cavalry Combat (tech ID DEHCCavalryCombatItalian) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Fortress Age. Effect: Cavalry: hit points +15%, damage +15%; Ships 1 Spanish Treasure Chest.

Quick answers (3)

Which civilizations have the Cavalry Combat card?: Italians.
What does Cavalry Combat do in AoE3?: Cavalry: hit points +15%, damage +15%; Ships 1 Spanish Treasure Chest. The game says: "All cavalry attack and hitpoints increased."
What is the tech ID of Cavalry Combat?: DEHCCavalryCombatItalian.

All cavalry attack and hitpoints increased.

What it does

Cavalry: hit points +15%, damage +15%
Ships 1 Spanish Treasure Chest(unit)

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

In these decks

ItaliansIII×1

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