Final answer:
The soldiers who lay still in Chapter 6 of 'The Red Badge of Courage' were dead, as indicated by the grim battlefield descriptions in the text.
Step-by-step explanation:
In Chapter 6 of The Red Badge of Courage, the soldiers who lay still are dead. This is evident from the description in the text that refers to soldiers stepping carefully to avoid disturbing those who lay without motion, depicting a battlefield after the fray, with several telling signs of death amongst the soldiers. The passage describes the intense and desperate situation of the battle, where the wounded and dead were numerous and the survivors were left in a state of shock and exhaustion.