[TOMT][Live Action Movie][2010s-2020s] Fantasy/Medieval woman flees through portal in cave to modern man's property. He defeats the army with firearms and modern equipment, becoming a hero of legend (or fulfilling a prophecy) in the process.

I remember finding this movie a couple years ago on a movie recap channel (some had really good obscure pulls) after watching the same or another cover Overlord (2018) and Guardians (2017). The movie was at some point on Tubi or Freevee (If it's still on the service, I did not have an account so watch history was not saved). Unfortunately I can only remember the general plot and a few specific scenes, so bear with me.

A fantasy/medieval lady is running from monsters (I cannot remember if they are also humans, or some humanoid creatures), and ends up fleeing into a cave that turns out to be a portal to the real/modern world. She exits in a hilly area and eventually ends up at the main protagonist's property, which is a house surrounded by a couple of fields and maybe a small forest - the cliche """off grid""" style home.

At some point more regular humans arrive, be it people wanting to tour the property before buying it; a couple of fantasy lady's allies showing up; family returning to the property; or the main protagonist "calling in backup". Either way, they end up helping fight off the invaders.

One or two of the group positions themselves on the roof of the home with a sniper rifle. I believe it may have been an anti-material rifle like a barrett, though it may have been a standard bolt or DMR.

They end up driving an old flatbed truck or other vehicle into the field in order to better face the oncoming army before they can surround the house, though it ends up being destroyed.

The main protagonist goes through the cave/portal to quell the invaders at the source, victory is achieved.

That is all I distinctly remember as absolute fact without potentially melding multiple movies together and or unwittingly making something up while trying to remember more than I can.