The Port

"That...is for Bill!"

- Louis

The Port is the third and last chapter in Left 4 Dead 2 ' s The Passing campaign. As the two teams of Survivors meet at the bridge, they work out a plan to grab the gas cans to start the generator. Under attack from all around, the two teams work together to survive long enough for the generator to lower the raised bridge.

Campaign
When you get out of the safe room, you should encounter the other side of the bridge, with Francis, Louis, and Zoey congratulating you and telling you how to power the generator. Basically a Scavenge map similar to Dead Center's finale, the Survivors have to collect all of the Gas cans. Also, every time there is a Tank battle after the first one, they may be two Tanks at the same time.

Louis, Francis, and Zoey will assist the Survivors with gunfire and various items such as Bile bombs and First aid kits when they are near the generator area, although they will generally already be killing any Infected in their vicinity. As Louis is manning a Heavy Machine Gun, and Francis and Zoey are using Tier 2 weapons with ammo caches next to them, this is especially useful when the Tank arrives, where the Survivors may either get the opportunity to let them do the task of killing the Tank (earning an Achievement), or combining gunfire to make Tanks fall even faster. The Survivors must still get the Gas cans, of which there are 16 to find in Campaign, Realism and Versus, and 10 in Single Player mode. Once the Survivors have fed all the cans into the generator, the bridge will lower after a short duration, and then the Survivors must make a run for it all the way to the race car. If you live, you are rewarded with a scene with the original Survivors cheering you on while you drive out the city.

A strategy you can use at the finale is circling around the map, collecting Gas cans as you go. Start from the single Gas can inside the building, and work your way around clockwise. This is a great strategy to use with co-op and versus, due to the street in the center being a quick way to fuel the generator, grab ammo, and get extra items and weapons from the original Survivors.

Surviving the finale
Multiple Special Infected will appear at once sometimes so don't go too far from the original Survivors.

Like Swamp Fever, two Tanks may appear at some points. If this happens, run to the bridge so the original Survivors can deal with them.

At the beginning of the finale go for the gas cans that are too far from the original Survivors to save time.