question #2 Sahih al-Bukhari 2920, Book 56, Hadith 133 : How does Islamic jurisprudence address personal discomfort or health concerns during warfare?

As above.Narrated Anas:`Abdur Rahman bin `Auf and Az-Zubair complained to the Prophet, i.e. about the lice (that caused
itching) so he allowed them to wear silken clothes. I saw them wearing such clothes in a holy battle.