Final notes ...

XVIII June (Plains of Waterloo)
Although the "Battle of Waterloo" took place on June 18, 1815, it was actually the culmination of a several-day campaign. Napoleon, who had just returned from Elba, knew that all Europe would soon turn against him. His only hope was to defeat his enemies piecemeal - starting with the Anglo-Dutch army of Ellington (the hero of the Peninsular campaign) and the Prussian army of Blucher. Even though Napoleon started levying troops immediately, Wellington and Blucher together outnumbered the forces at his command by better than three to two. He had to separate them. He undertook this by dividing his army into two wings, the left under Ney and the right under Grouchy. (This was probably Napoleon's worst mistake of the campaign. He left his three of his best Marshals - Soult, Suchet, and Davout - in minor roles, while making the uninspired Ney and the inexperienced Grouchy his field commanders).

Napoleon struck first on June 16. Ordering Ney to attack Wellington's rearguard at Quatre Bras, Napoleon took Grouchy's reinforced right and attacked Blucher at Ligny. Ney's attack accomplished little, but Grouchy beat Blucher handily at Ligny. Napoleon had apparently achieved his objective; Blucher was forced to retreat - which took him away from Wellington. He therefore swung the larger part of his army back to deal with the British.

Unfortunately for the French, Blucher didn't retreat far. Even worse, Grouchy didn't follow him closely. Ney's errors topped things off. Given field command by Napoleon at Waterloo (June 18), Ney was unable to dislodge Wellington before Blucher returned to the battlefield. Since Grouchy didn't show up, Blucher and Wellington swept Ney from the field, ending Napoleon's dreams forever.

The other general mentioned in the song, Jerome, was Napoleon's younger brother. At Waterloo he commanded Ney's left, and failed completely to rout the British from their stronghold of Hougoumont.

The Zebra Dun
There's some info about the song here.

It says here that "Zebra dun is the most common expression of the dun factor. These horses have black points and bodies of some shade of tan or yellow. They tend to be more of a tan shade than the clearer yellow of buckskins. Their heads are usually darker than the body shade. Duns are from pale silver thru a peanut butter shade to a olden dun. Darker shades can be nearly bay, but lack the true red color of a bay. Zebra duns with heavy countershading over the dorsal area are called coyote duns."

Thanks to all!