How to pronounce “excelsior” in English

Sickles knew what this would have, the Civil War happens. Now, the story of how—I'm running out of time, a story of how Dan Sickles became the General in Commandof Excelsior Brigade, the great stories, it's in the book. I don't have time to say it now, but it involves upstate New York versus New York City, Democrats and Republicans in theSenate, the State versus Federal Bureaucracy. And it ends up with a scandal involving President Lincoln, Mary Todd Lincoln, the White House gardener and an undercover newspaper reporter