Letter from J [John] Herschel, Brompton Barracks, Chatham, to 'Bella' [Isabella Herschel] He would have answered her numerous questions had he not been busy but the rest of his term arrived on Wednesday and Thursday and he had to get them settled. He has been on field duty, building trenches against a mimic attack. He gives messages for family members and notes marching in a keen wind that afternoon. 21 March 1857