Skirmishers can shoot in any direction, though individual models can be pivoted on the spot so that the unit looks more realistic (this does not count as movement).
Thanks to their special training and loose formation, models in a skirmishing unit do not block the line of sight of other members of their own unit (including characters that have joined the unit).
Enemies shooting against a unit of Unit Strength 1 skirmishers suffer a -1 to hit penalty in the same way as if they were shooting at a single man-sized model with a Unit Strength of 1 (see the Shooting section).