Whilst the rest of the expeditionary force marches forth above ground, teams of Miners attempt to encircle the enemy from below.
Source: Warhammer: The Old World Online Rules Index
Subterranean AmbushURL Copied!
If your army includes a unit of Miners you may, after both sides have deployed but before the first turn of the game begins, deploy two 32mm round Mine markers, plus one additional marker for each additional unit of Miners your army includes. These markers can be deployed anywhere on the battlefield that is not within:
The enemy player's deployment zone
12" of another friendly Mine marker
6" of an enemy unit
3" of a special feature or an objective marker
When a unit of Miners would arrive onto the battlefield as Reserves, it can be placed anywhere on the battlefield within 6" of a Mine marker, but not within 6" of an enemy unit. The unit cannot charge during this turn and counts as having moved for the purposes of shooting, but can otherwise act as normal.