The siege of Base 46 (Arabic: حصار الفوج 46) was a siege of the Syrian Army base at Urum al-Sughra by opposition forces waged from late September 2012 until 19 November 2012 as part of the Syrian Civil War. It ended on 19 November 2012 after opposition forces stormed and captured Base 46, in what is considered a key strategic victory for Free Syrian Army (FSA) forces operating in northern Syria.