OP: Warrior Talk News
A Study Of Fighting In Your House
  Fighting in houses...or fighting in your house can take on many forms  depending on your mission. Having clarity of mission is essential so you  know how to comport yourself in each event. I want to be very clear  that this is one of the most dangerous activities that a homeowner may  encounter.
Sadly, most training out there is limited to the police application, which I call “hunt the burglar”.  This has very little in common with much of what you may need to do if you are not in that line of work.
1). Holding Ground.  This is the most common home defense type scenario. Think of the  classic scenario where a homeowner is awaken by a strange sound  indicating a break in.  They barricade themselves  in the bedroom with the old double barreled shotgun, issue the classic  warning, “I have a gun” and then call the police. We hear stories like  this all the time.   
The  homeowner has no pressing need to enter the fight or go in search of  the threat so he simply takes up a position of advantage, using as much  cover and concealment as a bedroom will allow. He points his muzzle at  the bedroom door chanelizing the avenue of approach of the bad guy and  waits in ambush. When the bad guy forces his way into the bedroom, a  "warning" may or may not be given depending on the tactical situation  and the region.
For  this very elementary event there is little need for any skills at all  other than pointing the weapon and having the will to fire it at the  home invader.  They do however, need to have a weapon in the first place.
While many CCW folks advise this as what you always need to do, it is a very limited application.  Will you do this if the rest of your family is still out there at the mercy of the home invader?  Of course not. 
Think  of the previous scenario except the homeowner is awakened by the sound  of glass breaking, their child’s terrified screams in a bedroom across  the house are suddenly muffled and they hear a stranger’s voice telling  them to shut up.
This is hardly the time to hide under the bed with a shotgun is it? 
This situation requires moving rapidly and stealthily directly to the threat.  The mission is not to stay safe, it is to go to the fight.  The  mission is to close on the bad guys and shoot them to the ground with  surgical close range gunfire. The urgency of the situation probably  proscribes any negotiation, warnings, or attempt to deescalate the  situation. The bad guys are located, closed upon, and shot down in order  to save the innocents they are victimizing.
A similar situation is presented in an active shooter event where you have elected to stay and fight rather than run away. And before you discount this, there are plenty of reasons to do just that if family members or others for whom you are responsible are still in the danger area. You are not going to abandon your kids at Trolley Square or the Tacoma Mall and run for your life are you?
3). Traversing Through.  Traversing involves traveling through a contested or conflict area  where there may be active armed bad guys. The mission is not to engage  them, but rather to escape them. But understand, getting shot in the  back is no way to escape.  The operator (s) and  their protectees move rapidly through and out, free of the threat area,  but ready to engage any threats that may appear or impede their exit. 
Think of the active shooter event where there are multiple shooters but their immediate whereabouts are not certain.  All you know is that the current place is not safe and that remaining there is not a good idea.  You need to escape but running into one or more of them on the way out is a very real possibility.
There  is no time to clear or search. You move quickly as before, giving  cursory attention to danger areas with eyes and muzzles on the approach  and egress, but no attempt would be made to “clear them” or search them.  As  soon as a danger area is passed, it is abandoned as new danger areas  appear. The goal is to escape...but in a strong and controlled manner  ready to convert escape into attack if necessary.
 4). Search and Clear.  This is an area of study that is often the basis of many "shoothouse"  training events. It involves moving cautiously and deliberately through  an area in direct search for an adversary that is presumably hidden or  unaware of the good guy's presence. It is basically an indoor manhunt. 
Most people have no idea how strenuous this is both physically and mentally, nor how dangerous it is when done alone.  A typical 3000 square foot house for example might take the better part of an hour to search correctly by a team of three.  And by search I mean doing it right, not simply turning the lights on and peeking into a room then declaring it clear.
All  of these require a thorough understanding of the nature of  architectural features commonly found in modern buildings such as  corners, hallways, doors, stairs, etc., and how to negotiate them at  various speeds.  You would also need the ability  to identify danger areas and potential threats, and the ability to mold  your fighting platform to the environment at hand. As well, you need a  clear understanding of what your mission is at any given moment as well  as the fact that things can change quickly from one mission profile to  another.  
A  lot of the choices you make will depend on how much information you  have. This is not the time to be thinking about liability and stuff like  that. If you do, you'll lose.
Consider these situations 
1).  You wake up at 3:00 AM because you heard something. You are not certain  enough to go back to sleep but not certain enough to call 911.  
2).  The noise that wakes you up is much more pronounced than in #1. Still  not confirmed "human" but definitely something is not right.
3). You wake up to the sound of glass breaking and swearing. You live alone.
4).  You wake up at 3:00 AM because you heard your kid scream across the  house. His or her scream was followed by a male voice telling them to  shut up.
5).  You are at church and your kids are across the on the other side of the  church at youth ministry. You hear gun shots coming from that  direction, people screaming and running away from the sound.
6).  You and your protectees are inside a building where bad things are  happening. Your current location is untenable and you must leave but  expect to encounter resistance as part of the escape.
While each event is similar, the dynamics of the fight are different and each one requires different tactics. Think about this now and how you might handle each one of these problems. Think also about what skills you might need to make your time in the fight safer for you and more dangerous for the bad guys.
