(IMHO)I think the deaths of Harris and Hagman in Waterloo were depicted quite well and typically of how such things tend to happen. It was again through a blunder by the young and inept Prince of Orange during a French attack on the farmhouse, Hagman knocked down by a fleeing cowardly Prince (portrayed on screen) and then shot by a French Infantryman, and Harris falling victim to a bayonet as his only thoughts wer for his fallen comrade.
They had originally left the farm with Sharpe and Harper when Sharpe refused to obey any more of the Princes orders and after witnessing his (the Prince) latest blunder which led to the slaughter of their comrades trying to 'retake' the Farmhouse.
They apparently returned to the Farmhouse out of loyalty and respect for their comrades inside as they knew (I suspect) how desperate the battle for that crucial place was.
And yes I do like the series and have it on DVD along with all the books and the books are excellent...
I also like Sean in other productions and my mobile is O2.....

....but thats supplied through work....