This is ideas i got from watching the last of the mohicans, partly inspired by at least,here goes.
There would be a covert war going on between Europe and America, then both sides devellop time travel and try to ensure that the other never exists.
I would be part of a team sent from 2020 to 1750 to set up a beacon, in one of the original 13 colonies, to enable agents and equipment to be sent back more easily. 5 seconds after we arrive, we're fired on with automatic weapons by a european team, who got our arrival location from a mole in our command staff.
Im the only one to get out of the clearing alive and reach the top of a waterfall. My head is clipped by a bullet and i fall off the top and fall from sight of my ambushers. Instead of dying, im found by a hunting party along the river and brought to their tribal settlement.
When i wake up, i dont remember anything about where im from or why, near total amnesia. My sensual figure and blonde hair ensures that im offered to someone high up in the tribe, the head warrior perhaps. My camoflage uniform, and anything else that i had on me when i was found, including the beacon, are hidden away.
5 or 7 years pass, i settle into life there, bear my husband one or two kids. I stay out of sight whenever a european contigent comes to the settlement, though i dont know why. I also know things without knowing how. I was told about events in the time period that i was sent to, to stay out of historys way.
My knowledge, which comes to me in dreams, helps the tribe to avoid ambushes or bad deals with other tribes. In 1755 or 57, another team arrives, although time isnt relative, detects my subdermal implant, approaches the edge of the tribal settlement, and sees me.
They snatch me when i leave with two other women and question me to find out why the beacon i had wasnt activated and hidden, or why ive become the wife of a tribal warrior.
This depends on what tribe you know how to play a part of, or if you can play the role of the team leader thats sent back.
This one is still open, the person who expressed interest hasnt started it, so its still open to anyone who wants to play this one out with me.