There were his two invasions of Vietnam, and his two invasions of Burma, both of which resulted in Pyrrhic victories thanks to their sheer, insane cost.
Following a devastating defeat at Isandlwana at the hands of the Zulu host, the British conducted the famous defence of Rorke's Drift, winning a Pyrrhic victory.
Managing to get to within a few kilometres of the Moon's surface may sound like something of a pyrrhic victory, but it shows that most of the company's engineering works.
Sadly the concussive force of explosives powerful enough to actually kill a megalodon shark will also crush the hull of your submersible, and leave you with a Pyrrhic victory at best.
The Battle of Thermopylae would come to be known as a pyrrhic victory- or a victory where the cost is so high, that it can hardly be considered a victory at all.