"The Crimson Banner" is a traditional Irish song, also known as "The Eighteenth of December" and "No Surrender!". Written by William Blacker in 1818, it is part of the Protestant Loyalist tradition. It celebrates the closing of the gates of the Ulster city of Derry to the approaching Jacobite Irish Army on 18 December 1688. Its lyrics also cover the subsequent Siege of Derry in 1689 when the Williamite forces held out until being relieved. The siege popularised the term "No Surrender!", which had previously been used by the defenders of Bandon earlier the same year.