What does Strelet Horde do in AoE3?

Strelet: hit points +10%, range (Ranged (defend)) +1, range (Ranged (stagger)) +1, range (Ranged) +1. The game says: "Each Blockhouse will do a one-time muster of 5 Streltsy. Increases Strelet hitpoints and range."

Home City card

Strelet Horde

Strelet Horde (tech ID HCSpawnStrelet) is a Home City card in AoE3: Definitive Edition 100.19.18309, in the decks of 1 civilization, sent from the Industrial Age. Effect: Strelet: hit points +10%, range (Ranged (defend)) +1, range (Ranged (stagger)) +1, range (Ranged) +1.

Quick answers (3)

Which civilizations have the Strelet Horde card?: Russians.
What does Strelet Horde do in AoE3?: Strelet: hit points +10%, range (Ranged (defend)) +1, range (Ranged (stagger)) +1, range (Ranged) +1. The game says: "Each Blockhouse will do a one-time muster of 5 Streltsy. Increases Strelet hitpoints and range."
What is the tech ID of Strelet Horde?: HCSpawnStrelet.

Each Blockhouse will do a one-time muster of 5 Streltsy. Increases Strelet hitpoints and range.

What it does

Strelet: hit points +10%, range (Ranged (defend)) +1, range (Ranged (stagger)) +1, range (Ranged) +1, line of sight +1

1 further effect (interface, visuals or AI) not listed.

Cost: 1
Sent from: IV
Times it can be sent: 1
Game ID: HCSpawnStrelet

In these decks

RussiansIV×1

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