Mont-Saint-Jean escarpment. He could not capture Hougoumont but inflicted a defeat so great (about 15,000 to his 6,500) that the position was no longer tenable and Wellington ordered a retreat from Hougoumont. On Napoleon’s flank, Grouchy manages to destroy Blucher’s army and leaves Blucher with only 3,200 men when he joined up with Wellington. Grouchy managed to link up with Napoleon, giving Napoleon 25,000 much needed men and 76 cannons. With those reinforcements, Napoleon managed to destroy Wellington’s and Blucher’s army at terms. These were the terms: The terms were ratified on July 16, 1815.