Robert Napier. Responsible for an extraordinary feat of bad-assery, the rescue of a group of missionaries at Magdala, in what is now Ethiopia:
...Napier's troops reached the foot of Magdala on 9 April and the next day, Good Friday, where they defeated the 9,000 troops still loyal to Tewodros at the Battle of Magdala for the loss of only 2 British lives. Although Emperor Tewodros surrendered his hostages and made repeated efforts for a negotiated surrender, Napier pressed on and ordered an assault on the mountain redoubt 13 April. The British captured Magdala, and Emperor Tewodros took his own life, preferring to "fall into the hands of God, rather than man. Napier then ordered the destruction of Tewodros' artillery and the burning of Magdala. The expedition and its troops looted many historical and religious artifacts, which they took back to Britain. The looted artifacts still reside in collections in the UK, despite representations by various parties for their return.
Also, Lord Kitchener was very bad-ass. He was in charge at Omdurman, one of the most one-sided battles in history.