La Haye Sainte (French pronunciation: [la ɛ sɛ̃t], lit. 'The Holy Hedge', named either after Jesus' crown of thorns or a nearby bramble hedge) is a walled farmhouse compound at the foot of an escarpment near Waterloo, Belgium, on the N5 road connecting Brussels and Charleroi. It has changed very little since it played a crucial part in the Battle of Waterloo on 18 June 1815.
La Haye Sainte was defended by about 400 King's German Legion troops during the Battle of Waterloo. Being greatly outnumbered by attacking French forces, the defenders held out until the late afternoon when they retired as their ammunition had run out. If Napoleon Bonaparte's army had captured La Haye Sainte earlier in the day, he would have almost certainly broken through the allied centre and defeated the Duke of Wellington's army.