The good news is that I probably have that issue of Analog in a box somewhere in the garage.
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)
Thanks but unfortunately I can not find a synopsis of the story to know if it is the right one.The good news is that I probably have that issue of Analog in a box somewhere in the garage.
I strongly suspect this is the one you're looking for.
What I recollect of the plot is: military incursion fails, survivors are absorbed by the colony. The colony is young and relatively small. Huge families are encouraged, women marry when very young. Protagonist is a survivor of the initial military expedition. He's given a farm, and paired with a girl of, I think, 13. He has some misgivings but eventually kind of goes with the flow. Military off-worlders try again. The colonists, warned by the surviving invaders, successfully resist.
The story was controversial at the time, generating a stream of letters in the months following publication.