In 1937 [[Heinz Guderian]] wrote the book ''Achtung - Panzer!'' describing the combined arms tactics used initially by the Germans in WWII and later on by armies throughout the world. The Germans tested an application of these tactics in 1938 during the [[Spanish Civil War]] and as a result [[German High Command]] formulated plans to dismantle Polish defenses in 1939. <ref>http://www.britannica.com/eb/article-9068990/Spanish-Civil-War</ref> | In 1937 [[Heinz Guderian]] wrote the book ''Achtung - Panzer!'' describing the combined arms tactics used initially by the Germans in WWII and later on by armies throughout the world. The Germans tested an application of these tactics in 1938 during the [[Spanish Civil War]] and as a result [[German High Command]] formulated plans to dismantle Polish defenses in 1939. <ref>http://www.britannica.com/eb/article-9068990/Spanish-Civil-War</ref> |