The guns that boomed over the Napoleonic battlefield could be fired at a rate of two rounds a minute, blasting all and sundry in range to tiny pieces. No small wonder that the artillery of the period was so feared. However, supplying the guns was a tricky proposition, as the ammunition for the guns was bulky, difficult to move and dangerous to handle. Over train as wild as Portugal and Spain, command of Wellington's field train was bound to be an...