Simple survival strategy.

You live in a small neighborhood.

One day, your country is invaded by a fully armed and well funded terrorist group.

Despite strong military action, your country's borders are being pushed back smaller and smaller.

The terrorist group will reach your neighborhood in approximately one week.

One of your neighbors is an avid hunter, and has a basement that contains rifles, shotguns, and a few handguns.

You have handled fire-arms before, and are capable of using guns.

You also have the knowledge to make home-made smoke bombs and small explosives.