en.wikipedia.org/wiki/Dragoon

The named person cannot fit the date given. A major reference work identifies Alexander Farnese as born on 27 August 1545 and says he became duke of Parma in 1586 after his father's death. Treccani likewise identifies him as 1545–1592 and notes that he inherited the ducal title from 1586. That means the article's statement that "In 1552, Alexander Farnese, Duke of Parma" carried out this military action is impossible: in 1552 he was a child and not yet Duke of Parma.

This does not prove the underlying military anecdote is false in every form, but it does show that attributing it to Alexander Farnese, Duke of Parma, in 1552 is incorrect.

The sentence is specifically about the four regiments of light dragoons raised in January 1777. But the Battle of White Plains took place on 28 October 1776, months earlier. The American Battlefield Trust states that, after the loss of New York, Congress augmented Washington's army with four regiments of Continental Dragoons early in 1777. The National Park Service's Revolutionary War timeline dates White Plains to 28 Oct. 1776.

So, while other mounted units existed in 1776, the particular four regiments described in the immediately preceding sentence could not have fought at White Plains because they had not yet been raised.

This sentence combines the wrong coalition with the wrong year. A standard history of the Napoleonic Wars identifies the War of the Sixth Coalition as 1813–1814. A West Point article on the origins of mission command notes that the Prussian Army suffered catastrophic defeat at Jena and Auerstedt in 1806. So 1806 cannot be "the start of the War of the Sixth Coalition." It refers instead to the earlier phase of the Napoleonic Wars, commonly called the Fourth Coalition.

The underlying detail that Prussia had dragoon regiments in 1806 may be fine, but the article's label "War of the Sixth Coalition in 1806" is historically incorrect.