1.   As she crouched in the tall grass outside her home, trying to use the darkness as cover, she heard Roger calling to her.

2.   Sporadic explosions and exchanges of fire echoed in the besieged capital, and the city government used darkness as a shield overnight to put up anti-sniper baricades.

3.   Sporadic explosions and exchanges of fire echoed in the capital, and the city government used darkness as a shield to put up more anti-sniper baricades overnight.

4.   Using darkness for cover, activists smashed a window in a Wisconsin warehouse, crawled inside and placed incendiary devices on a propane tank.