By Brian C. Pohanka Now I like Garryowen, When I hear it at home, But it's not half so sweet when you're going to be kilt.     -- From Charles Lever's 'Charles O'Malley, the Irish Dragoon' (Dublin, 1841) Myles Walter Keogh was born on March 25, 1840, at Orchard House, a stone dwelling that still stands near the village of Leighlinbridge, County Carlow. Myles' father, John Keogh -- the name…