An article by Dick Tennant about a fundamental aspect of logistics from ancient times and still very relevant in the Napoleonic period - and beyond....
Wellington's Mules Download
Picture credit
http://gibraltar-intro.blogspot.co.uk/2014/12/1705-two-centuries-of-smuggling-la-cosa.html
A very interesting article by Neville Chipulina about Gibraltar and smuggling!
Original caption
Arrieros de Gibraltar - a rather diplomatic title for a picture which actually represents a couple of smugglers and their mules near Gaucin, half way between Gibraltar and Ronda ( 1830s - David Roberts )