Wellington’s Spy Network: How a government-sponsored network of civilian agents complemented Wellington's own intelligence gathering.
Spying for Wellington: British Military Intelligence in the Peninsular War
Huw J. Davies
University of Oklahoma Press
328pp £30
Reviewed by Alan Mallinson, History Today Volume 69 Issue 10 October 2019

"...The value of this book is in explaining Wellington’s Peninsular campaign in the longer historical context of British intelligence handling, in particular what the later 19th- and early 20th-century rebooting of military intelligence gathering owes to the techniques developed in Spain. It serves not just as history, therefore, but as instruction. The British army would do well to make every officer read this excellent book.:

https://www.historytoday.com/reviews/wellington%E2%80%99s-spy-network