Nothing to do with the book, but would like to mention I've just discovered a document in the Arquivo Historico Militar online listing the names of, if not all, a lot of the non-military personnel tagging along with the Portuguese Army in 1814.
In those lists, there are a lot of women, some married to soldiers, some coming from the British Army, some 'belonging' to someone , some 'belonging' to no one (phrasing of the document).
Perhaps a statistical little article could be squeezed out of this, honouring the invisible machinery of an army, as said here, cleaning after the men.

The link is (copy full link + paste in browser):

http://infogestnet.dyndns.info/infogestnet2007/registo.aspx?id=128378|http%3a%2f%2finfogestnet.exercito.pt%2finfogestnet-pesquisa%2finfogestnet-pesquisa.asmx|&grupoarquivo=43&arquivo=AHM+-+Da+Guerra+Peninsular+%C3%A0+Regenera%C3%A7%C3%A3o&texto=batalha&tipo=registo

Jorge