Counter-Strike: Source/cs assault

cs_assault is a hostage rescue map, where the terrorists are inside a warehouse with the hostages, and the counter-terrorists have to assault it. On most servers, this is the only map where terrorists are allowed to blatantly camp the hostages, as it's an appropriate map.

Terrorist
For campers, playing as terrorists on cs_assault is very desirable, as camping is the de-facto strategy. However, there are many routes of attack for the counter-terrorists, so you should stay on your guard. In the first minute of the game, counter-terrorists usually attempt to gain entry to the warehouse through the ventilation system. At least two terrorists should stay upstairs and guard both vent exits: the one in the main warehouse, and the one in the ceiling of the office area. Left unguarded, the latter allows counter-terrorists easy access to the hostages, and gives them the chance to shoot you in the back, unexpectedly. At least one terrorist should also guard the bottom side door behind the cargo boxes. They should put themselves in a hidden position, immune from attack by counter-terrorists sniping through the railway door. A good position for this is hidden on the raised level (not upstairs) behind a pillar. It is quite dark there, and terrorists have been known to hide without being noticed there while the entire counter-terrorist team runs around the warehouse. A few adventurous counter-terrorists will always try the side door near the beginning of the round, but will be dispatched easily enough. Somebody patrolling the gantry on the forward side of the warehouse is also quite useful, as they are able to take out counter-terrorists in virtually any part of the warehouse without being in too much danger from snipers. The final few terrorists in the team should patrol around the entire warehouse, regularly checking that the hostage room hasn't been disturbed. A good tip is to make sure that any doors to the warehouse are always closed, or counter-terrorists could snipe through them.

Counter-terrorist
The counter-terrorists have a tough time on cs_assault, but a good co-ordinated attack will have a high chance of winning the round. Teamwork is of the essence, with assaults on two or more points being almost critical to winning. If the terrorist team isn't particularly well organised, a few counter-terrorists could infiltrate the ventilation system and exit in the office area, to grab the hostages and covertly shoot any terrorists in the back. However, this strategy is suicide if the terrorist team is on the ball, or if they see you coming: you are stuck in a small vent with limited manoeuverability, while terrorists are free to throw grenades in as they please. If sniper rifles are purchaseable on the server, one counter-terrorist should buy one and crouch down behind the railway door, to snipe off any terrorists wandering around on the gantry visible from such a position. This position is, however, open to assault by an adventurous terrorist rushing out from either side of the railway door. Some counter-terrorists should wait on the external staircase, opening the door and rushing back down before coming back up the stairs just enough to be able to shoot any terrorists inside. This minimises the visible area of your body, making it exceedingly hard for terrorists to shoot you. Later on in the round a couple of counter-terrorists could sneak in through the bottom side door (underneath the external staircase), as any terrorists initially guarding that door have usually wandered off by such a time in the round. Hiding in the shadows and shooting visible terrorists with silenced weapons can clear out the entire warehouse if you're against an average terrorist team.