Initially, you can abuse the fact that both you and anybody on your side cannot die, unless abducted by a raid and executed. And raid abductions can only happen to a restricted range of villagers, which does not include any of the MCs and any animals or monsters. If raid does manage to abduct someone, you can rescue them.So how do survive the enemies raid or raid at the enemy camp ? at time the invicible cheat just goes on and off on it's own. During the thickest of fight at time it turn off on it's own and result in nasty thing. So we need to use our pet tamed natives to help in raid or defense then ?
By midgame, you can just slaughter a raid personally without much thought put into it.
By lategame, you'll be adjusting raids to be stronger so that you can level up from them effectively.
So this leaves you with just a short but important time period when you learn how to fight.
When attacking their village, the main concern is to fight them one at a time. This is best done at night, when most villagers are sleeping, and there are only guards to fight.
When defending, putting scary monsters on the perimeter is a good plan. Putting non-combatants into "survivor" stance is excellent plan. And putting a raid magnet talisman on one of the MCs or one of the monsters is a good plan too.
Either way, you'll need to fight a raid someday. Use all the tricks known to humanity - kiting, setting traps, walls and so on. You can also pretend to be an anime warrior, and run through them, stopping behind their backs to say "too slow" and stab them in the back. Repeat that until they're all dead.