THE PENINSULAR COMMISSARY S. G. P. Ward Journal of the Society for Army Historical Research Vol. 75, No. 304 (Winter 1997), pp. 230-239 (10 pages) https://www.jstor.org/stable/44227358?refreqid=excelsior%3A3a1ba659d70d6361ce742ac1c2ad50e8&seq=1#metadata_info_tab_contents
Interesting. . . this was written forty years after his "Wellington's HQ" book.