Maybe I missed an explanation, but when Audie finally gets the women together at the mission, the only other man present is Sean McClorey's character. What happened to the men from the general store? You'd also think the community would have had at least a few men too old to serve around.
shareWhen he reached the region he helped the women defend (tough luck other Texan regions) Hewitt said the Sand Creek Massacre was 2 weeks ago, implying the date was about December 13, 1864, give or take a few days.
So he rode a long time, though possibly not long enough to travel the distance from Sand Creek in Colorado. If Hewitt rode in a straight line 20 to 40 miles a day for 11 to 17 days he would ride 220 to 680 miles.
The men in the general store were in Jonesboro, I think, on the border of Texas according to the onscreen title, and Hewitt rode on from there to his home region.
By the way, in real life there were no old missions in north Texas, they were all in south or middle Texas.
https://en.wikipedia.org/wiki/Spanish_missions_in_Texas#/media/File:Spanish_Missions_in_Texas.JPG
So obviously in real life Hewitt could not possibly have stopped and stayed to fight in a town like Jonesboro on the border of Texas if he was travelling to a region with an old abandoned Spanish mission.