Hello. You did not enter the text to which this question refers, which makes it impossible for your question to be answered. However, I will try to help you in the best possible way.
If the theme that war is brutal and terrible is developed through Henry's mother, we can consider that it shows a negative reaction towards the war. She may be showing fear, insecurity, anger and even revolt, showing that there is something, related to war that deeply bothers her, because she understands the danger, pain and destruction that war promotes. In that case, to answer that question, you must find this reaction that Henry's mother demonstrates and explain the element that causes it.