The Battle of Bosworth Field, which was fought on today's date, August 22 in the year 1486, was the climactic engagement in the English Civil War which took up the later half of the 15th Century, called "the War of the Roses". The war was essentially a struggle between the houses of Lancaster and York over which of them would hold the throne of England and thus rule the country. The Battle was won by the forces of Henry Tudor, the Earl of Richmond who would afterword would ascend to the throne as Henry VII, having vanquished the forces of King Richard III of the house of York whom he believed had usurped the throne via murder. Richard was killed during the battle; the last English king to suffer that fate in battle. As this marked a change to the house of York and the end of the Plantagenet dynasty over to the Tudors it is a very important moment in the history of England.
Richard Usurps the Throne
The murder which Richard was suspected was that of his nephew Edward V. Richard had become Lord High Protector when Edward IV died and his only successor was his son the 12 year old Edward V. But Richard managed to get himself declared King on July 6 1483 after
which date the young Edward was not seen in public again. Richard III (right) was of course widely suspected of having him murdered. Richard was also rumored to have murdered his own wife Queen Anne. There was also some troubles regarding the Princess Elizabeth, the elder sister of the murdered Prince, and whom she was going to marry. She was already engaged to marry Henry Tudor, the Earl of Richmond who had been across the English Channel in France waiting for the right opportunity to go and knock the usurper Richard off the throne. With Richard under a cloud of suspicion, now was the time.
Henry Lands in Wales, the Armies Clash at Bosworth
Henry, (below) with an army of 6,000 men landed unopposed at Milford Haven on the southwest coast of Wales on August 11, 1485. He
pushed immediately towards Richard, gathering support as he marched toward Richard's forces in London. Richard quickly gathered his forces, between 7,500 and 12,000 men, and the two finally clashed at Bosworth Field, near Leicestershire. A large portion of Richard's army was under and Sir William Stanley but he held back while they decided which side it would be most advantageous to support. Thus leaving Richard with fewer men at his disposal than he thought, Richard divided his army into three portions each with a specific goal. Stanley's inaction left the battle swaying back and forth until Richard apparently decided to bring it to an end by charging his group directly at Henry. When he saw Richard apart from the rest of his forces, Stanley decided to throw in with Henry which turned the tide against Richard. Seeing Henry fairly close by, Richard swung at him mightily, but was unable to get at him and was soon overwhelmed by Henry's men, who knocked him to the ground, and killed him there on that ground. thus ended the troublesome reign of the Richard III of the house of York.
Sources =
https://en.wikipedia.org/wiki/Battle_of_Bosworth_Field
https://www.historic-uk.com/HistoryMagazine/DestinationsUK/The-Battle-of-Bosworth-Field/
"Kingdoms of Europe" by Gene Gurney, Crown Publ., New York, 1982.