If either side has any Deep Strike troops in reserve, then when they become available they may deploy anywhere on the table. This can be by teleporting, flying troops swooping down from the skies, creatures being summoned from the warp, tunnellers emerging from underground, or any other means of extraordinary movement.
To deploy Deep Strike units, choose a point anywhere on the board and place the centre of the Ordnance blast marker there. Roll a Scatter dice. On a 'hit' the marker is on target, on an arrow the marker is off target – move it 2D6" in the direction shown. Once the final position of the marker has been established, place all the Deep Striking models on top of it, facing in any direction. Deep Strike troops may not move or assault on the turn that they arrive, but they may fire as normal (though they count as having moved and so may not fire heavy weapons, etc).
If you roll a double 1 the squad has been lost – victims of a terrible accident, lost in the warp, shot down by enemy fire or crushed underground.
If the marker misses the table then the Deep Strike troops are not available for the rest of the battle.