Thank you for your attention to this work.
When the first battle of Alma took place, there were a lot of wounded and the city infirmary simply could not accommodate everyone. The wounded were placed wherever it was possible. Mostly they were tents and bedding made of straw.
Subsequently, the following medical support system was built
Yellow and red zone. Zheltaya is an advanced dressing station (for the first time, there could be doctors here - they were not at the collection point for the wounded. Although Pirogov sometimes came against all the rules to these points). Krasnaya is the main dressing station (there were four of them). Then - hospitals (two). Then - rear hospitals (1,2,3 lines). And, finally, permanent (indispensable) hospitals - in the depths of the empire.
In general, the goal of medicine was to provide Christian assistance (shelter, food and warmth), and not to return the wounded to the ranks upon recovery. Wounds to the head and body are usually fatal. In the arm or leg - amputation.