A History of the Peninsular War by Charles Oman. Of the 7 volumes of this classic, the first two are available
I. 1807-1809. From the treaty of Fontainebleau to the battle of Corunna
http://books.google.com/books?id=MEEbAAAAMAAJ&dq=editions:ISBN1853676357&hl=es&pgis=1
II. Jan.-Sept. 1809. From the battle of Corunna to the end of the Talavera campaign
[url]http://books.google.com/books?id=w0EbAAAAMAAJ&q=intitle:war+peninsular++inauthor man&dq=intitle:war+peninsular++inauthor man&lr=&as_brr=0&hl=es[/url]
Note, that depending of your location you may need a proxy to have full access to the book and to be able to download a pdf
Memoirs of the War in Spain, from 1808 to 1814, by Marshall Suchet, 2 vols.
Volume 1
http://books.google.es/books?id=UCwKAAAAIAAJ&dq=editions:0dn_FJzyF2IxlSRyrSzGqXV&source=gbs_summary_s&cad=0
Volume 2
http://books.google.es/books?id=9isKAAAAIAAJ&dq=editions:0dn_FJzyF2IxlSRyrSzGqXV&source=gbs_summary_s&cad=0
If you know more, please post them