So, WI the 19th C British Army hadn't lost outstanding officers such as Black Bob at Ciudad Rodrigo in 1812, Ross at Baltimore in 1814, Pakenham at New Orleans in 1815, or Picton at Waterloo ? How much more could they have contributed had they not been KIA on the field of battle ? Of course, there's also for the RN WI Nelson hadn't been killed at Trafalgar...
btw, pls feel free to add any other such generals who were KIA during the Napoleonic period...