The <a href="https://en.wikipedia.org/wiki/Siege_of_Damascus_(1148)" id="mwRg" rel="mw:WikiLink" title="Siege of Damascus (1148)">Siege of Damascus</a> ends in a decisive crusader defeat and leads to the disintegration of the <a href="https://en.wikipedia.org/wiki/Second_Crusade" id="mwRw" rel="mw:WikiLink" title="Second Crusade">Second Crusade</a>.