Are you saying Nimrod Creasey md. Sarah Arthur in Bedford Co., VA?
Nimrod Newman (father of your Sidney Newman) married Sarah Arthur but prob. not in Bedford Co., VA because he didn't go there until 1770s after the Revolution; must've been in Dunmore (now Shenandoah Co.) VA when they married ca 1763.
Nimrod Newman wrote his will Mar 1815 in Grainger Co., TN, and it was recorded May 1815.