The 1918 Spring Offensive or Kaiserschlacht (Kaiser's Battle), also known as the Ludendorff Offensive, was a series of German attacks along the Western Front during World War I, which marked the deepest advances by either side since 1914.
There were four separate German attacks, codenamed Michael, Georgette, Gneisenau, and Blücher-Yorck. Michael was the main attack, which was intended to break through the Allied lines, outflank the British forces which held the front from the Somme River to the English Channel and defeat the British Army. Once this was achieved, it was hoped that the French would seek armistice terms.
Although the operation achieved complete surprise and succeeded in gaining huge tracts of ground, the operation lacked a strategic goal, allowing the Allies to reorganize themselves, and counter attack. Although the operation was a tactical German success, it was a strategical and operational failure.