Years ago...when our boys were young and we took long tent camping trips on the river and we always brought the dutch oven and a big big 50# bag of whole wheat flour and some bulk bread yeast.
As Mike says, use coals...so it was necessary to have a fire burn for awhile to get
enough coals to last long enough for baking a big loaf . It seems like we moved a pile of coals to the edge of the burning fire (and then still had the main fire for cooking other things and more coals if necessary)...made a nice bed of coals to set the oven on (it had feet) and then added more coals to the lid which had a rim that held them in place. I think I remember using the
ash scoop to move the coals around? We probably had a shovel along too though for other things.....
We rarely used the dutch oven at home because we had a
wood cook stove and other iron ware that worked better on the stove surface.
On a side note, I always blamed my cataracts on cooking over smokey fires...campfires, roasting peppers....etc.