Gravel Pit is the pinup map for attack vs defence. The map consists of 2 control points between the two teams’ spawns, and one point atop a tower just outside the defenders’ spawn. All points start of under the control of the defenders, and to win the attacking team must capture the first two points and then move on to capture the last one on the tower. If they can do this within the time limit (which goes up 3 minutes each time they capture a point) they win, but if the defenders manage to prevent them from taking all the points, then it’s a defensive victory.
At the start of the map there is a setup time period (depends on the server, but generally between 30 – 60 seconds) giving the defenders time to get organised and the attackers time to charge a medic or two. The attackers can choose between attacking point A or B first, and tend to team up in an attempt to overrun the defenders who are spread relatively thin across the two points. Capturing one point gives the attackers a 3 minute time bonus, allowing them to descend on the other point. Having taken that, it becomes an all out brawl in the middle of the map, as the attackers close on point C which is a quick capture, about 10 seconds for a single player.