 A young officer in the 4th Dragoons , Lieutenant William Light who later served on Graham 's staff and was a great admirer of the general , subsequently became the Surveyor General of South Australia in the 1830s . Light decided to name one of the valleys in the new colony Barossa Valley ( now a famous wine making region ) in memory of the victory , albeit misspelled due to a clerical error . It is often incorrectly stated that Light fought at the Battle of Barrosa but he was actually hundreds of miles to the north , his diary of 6 March 1811 recording he was with Wellington 's cavalry travelling through Santarem to Pernes . 
