Currently in 'Houses, Churches & Graveyards' a group of survivors have holed up inside of a church. They only open the front door in efforts to save other survivors stranded on the mean and inmate-zombie-infested streets. The church survivors have taken a play out of antiquity's playbook in order to help survivors get into the church. They use the phalanx... well, actually a 'broomstick phalanx'.
The history of fighting in the west is one that progressed from small bands of raiders, to larger but disorganized mobs of attackers. This would sometimes evolve into a situation where the disorganized rabble of toughs was led by a paramount chief, who would call out to the enemy's mob and challenge their leader to a one-on-one duel. In ancient Greece historians have lent the name Heroic Age to this type of fighting, which might not have ceased until approximately 10 centuries before the Common Era.
Sometime in the Fifth Century, Before the Common Era (BCE), even Rome adopted the Greek manner of fighting in its efforts to subdue its Italian neighbors. This reform of Rome's fighting style is often attributed to one of its kings named Servius Tullius (AKA the Servian Reforms). The phalanx is not always well suited for fighting in certain types of terrain, so eventually the Roman phalanx adapted smaller and more maneuverable phalanxes called 'maniples' but that is a story for another time.
How does this tie in with House, Churches & Graveyards? The survivors in the church, although small in number, adapt a phalanx formation in the front door entryway, which is an architectural choke point. A few can defend the choke point against many if done so with some organization. In this case the survivors have trashcan lids as overlapping shields. Also they have used duct tape to attach kitchen (chopping) knives to broomsticks (the church is very large and has a kitchen).
Will this plan work in the long run? Only one way to find out: read more Houses, Churches & Graveyards.