Guild Wars - State of the Game @ Official Site

This week's State of the Game article takes a look at "basic ganking". 

Gankers seek to take advantage of an unguarded base to reduce the number of NPCs the opponent will have at the flag stand at VoD and, if possible, to kill the Guild Lord before VoD. With twenty minutes between the start of the game and VoD, gank squads have plenty of opportunities to infiltrate and accomplish these goals.