End of the First Day After the Outbreak

Time frame: 6 to 24 hours after Outbreak
Phase: Containment

The first six hours after an Outbreak, depending on the strain, can really determine whether you (and humanity) survive. In Resident Evil, the Hive was overrun and had to be sealed off within mere hours. Consider yourself lucky if you haven't encountered a mob of zombies yet because any delay risks you being swarmed out in the open and making the establishment of Containment tenfold more difficult, if not impossible.

Once you are fairly certain that the building is zombie-free, regroup the survivors on the Main level of the building near the Main Entrance. Check if any of the group was injured or appears sick and place them in Quarantine. Check those already in Quarantine to see if any have started to turn. Setting up a secondary Quarantine zone may be necessary. Make sure that both Quarantine zones only have one entry/exit point each and that they are well guarded.

Do an inventory of weapons and distribute them amongst the group the best you can based on ability to utilize the weapon. Those without weapons should scour the building, particularly for defensive weapons. Cabinet doors can be used as make-shift shields. Since there are no zombies in the building, you can seal the Main Entrance as well. Post all long range weapons on the second floor overlooking the Main Entrance. Post 2/3 of the close combat and defensive weapons on the first floor behind the Main Entrance, while the other 1/3 will be posted at a secondary choke point separating the first and second floors. This way, if the Main Entrance is breached, defenders on the first floor can retreat up to the second floor and seal off the first floor. Also, make sure that all other entry points on the first floor are heavily barricaded and cannot be opened. I suggest placing several layers of furniture so that even if the first layer is broken, it doesn't produce a hole in your defenses, but rather a dent.

Since the Main Entrance is now closed, a new entry/exit point should be made overlooking the Main Entrance where the long range weapons are posted. As stated in a previous post (3-6 hours After Outbreak), the optimal size of your group should be between 30-50. If there are still people running around outside and you still haven't hit the 50 count, lower a rope or hose to allow them to enter through the new entrance on the second floor. If you are already over the 50 count, instruct additional survivors to establish a second base in a nearby location, based on the earlier reconnaissance done by Group D. Taking on a group much larger than 50 will cause the group to consume scare resources (such as food) faster than can be gathered as well as make intra-group communication difficult. If saving the additional people are absolutely necessary, take 1/3 of your current weaponry and population to accompany the additional people to establish a base at the secondary location. For the sake of humanity, you must only save people when it doesn't impact the future success of the current group.

Finally, as the First Day comes to a close, get some rest, but ensure that at least 1/3 of the defense remains at their post, rotating in and out with others, so that all gets rest at some point.

Containment Established. Containment Phase Complete.