<a href="https://en.wikipedia.org/wiki/American_Civil_War" id="mwjQ" rel="mw:WikiLink" title="American Civil War">American Civil War</a>: <a href="https://en.wikipedia.org/wiki/George_B._McClellan" id="mwjg" rel="mw:WikiLink" title="George B. McClellan">George B. McClellan</a> assumes command of the <a href="https://en.wikipedia.org/wiki/Army_of_the_Potomac" id="mwjw" rel="mw:WikiLink" title="Army of the Potomac">Army of the Potomac</a> following a disastrous <a href="https://en.wikipedia.org/wiki/Union_Army" id="mwkA" rel="mw:WikiLink" title="Union Army">Union</a> defeat at the <a href="https://en.wikipedia.org/wiki/First_Battle_of_Bull_Run" id="mwkQ" rel="mw:WikiLink" title="First Battle of Bull Run">First Battle of Bull Run</a>.