When Clint Walker's character kills Brian Keith's to get Keith's guns, technically he has committed armed robbery and murder. Though, it is doubtful if anyone in Fort Dobbs would have convicted him.
One brief scene shows the Indians attaching across a river. There is no river near Fort Dobbs. Warner Brothers used a lot of scenes from different movies over and over to save money.
The repeating Henry rifles brought to the fort just in time are not loaded, but when they are passed up to the men defending the fort atop its walls along with boxes of ammunition, the men begin shooting them immediately, before they are loaded.
When Gar and the Greys leave the house, Gar is holding a cloth bag. Later, the bag becomes larger and holds many cooking utensils, beans, and other food.