Coordinated Defense, use the terrain.

Political tags — such as royalist, communist, democrat, populist, fascist, liberal, conservative, and so forth — are never basic criteria. The human race divides politically into those who want people to be controlled and those who have no such desire.
--Robert Heinlein

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American Mercenary
VERBATIM POST

I have written before the words of men smarter than I, "It isn't a silver bullet, but the right mix of weapons that wins a war." One of the tenants of modern warfare is that "you don't win by withdrawal."

But you can't always be on the offensive, so what do you do? You become offensively defensive. Napoleon and Hitler both found out the hard way that "offensive defense" will suck the combat power out of your Army quickly. Let us set up a scenario, you are a German Jew in an alternate timeline where Hitler's rise to power happened in the 1960's. You've seen the writing on the wall and decide to be "Defiant" and resist to the end. You don't have a "silver bullet" weapon that will win your war, but you have access to a few hunting rifles and some captured military hardware.

So how do you get the right mix with what you have? By choosing the time and place of the fight. To choose wisely you need to know what you have, and what it can do, and where it can be most effective.

If you have four men with AK's, and four men with bolt action 30-06 Deer rifles, how do you match them up to kill the most of the jack booted thugs who come to kill them? Do you mate them up as sniper teams? Not likely, sniping and spotting is a skilled task. Better to make two teams of bolt rifle men at ranges 400 to 800 meters away from the kill zone, and the short range riflemen between 150 and 250 meters away. Spread them out so that a mortar round won't kill all four. Spread the bolt riflemen out so that their sectors of fire provide each other security.

What you do is set them up into three or four positions, so that the men with AK's can use a "reverse slope defense" of their position, and the bolt action long range teams can cover the flanks. A reverse slope defense is not intuitive, it is staying well behind the crest of a hill so that the enemy comes into view and gets shot. The downside is that if you lack the firepower to kill the enemy as they present themselves you will be overrun, but the tactical advantage is that the enemy cannot mass firepower against you.

A properly prepared defense is made by the acronym PMSDF. Preparation, Massing Effects, Security, Disruption, and Flexibility.

Never stop preparing, prepare fields of fire, prepare avenues of egress, prepare obstacles to channel the aggressor. Massing effects means that you coordinate your assets so that you kill the most of them for the least of you, do this by assigning sectors of fire and priorities of fire. Security, if you don't have 360 security you are killing yourself and your men, if you don't conceal yourself from the "eyes in the sky" then you are killing yourself all over again, even at night.

Disrupt the enemies movements, plans, and tempo. And flexibility, make sure you can flex out of any one position to fight from another. Even your "go to hell plan" needs to have two or three variations.

But use the terrain, find a slope that you can overwatch with long rifles and defend with shorter range weapons, keep a river or swamp between you and the enemy if you can. Natural obstacles are just as effective as concertina wire or a tank ditch. Complex urban terrain requires a lot more planning, and has more risks of civilian interference. However life is risky, and we reduce risk by planning.

So plan your defense. Then attack yourself and see if you can flank your planned position, or if you can find an avenue of approach that allows the attackers to set up intersecting grazing fire. Then adjust your defenses to deny the attacker those advantages. Accept some risk, but mitigate it to the best of your ability by planning, preparing, and practicing "offensive defense."