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 the First World War , beginning on 21 March 1918 , which marked the deepest advances by either side since 1914 .
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 .