Fall Weiss ("Case White", "Plan White"; German spellingFall Weiß) was the German strategic plan for theinvasion of Poland. The German militaryHigh Command finalized its operational orders on 15 June 1939 andthe invasion commenced on 1 September, precipitatingWorld War II.^[1]

The origins of the plan went back to 1928, whenWerner von Fritsch started working on it.^[2]Fall Weiss was developed primarily byGünther Blumentritt andErich von Manstein while the two were serving as staff officers under GeneralGerd von Rundstedt withArmy Group South inSilesia.

The plan called for a start of hostilities before thedeclaration of war.Wehrmacht units were to invade Poland from three directions:

• A primary attack from the German mainland across the western border of Poland.
• A secondary attack from the north, from the exclave ofEast Prussia.
• A tertiary attack by German and alliedSlovak units across the border of Slovakia.

All three assaults were to converge onWarsaw^[3] while the main Polish army was to be encircled and destroyed west of theVistula River.

The plan was initiated on 1 September 1939 and was the first European military operation of World War II.

• Plan Zachód for the Polish defence plan
• German order of battle for Operation Fall Weiss
• List of Axis operational codenames in the European Theatre

Other German plans named for colors:

• Fall Rot ("Case Red") (1940) – planned defense against an incursion byFrance following a German invasion ofCzechoslovakia.
• Fall Grün (Czechoslovakia) ("Case Green") (1938) – planned invasion ofCzechoslovakia.
• Fall Gelb ("Case Yellow") (1940) – also known as the "Manstein Plan", theoffensive against the BeNeLux States and France.
• Fall Grün (Ireland) ("Case Green") (1940) – planned invasion ofIreland.
• Fall Blau ("Case Blue") (1942) – summer offensive on theEastern Front in southern Russia.
• Operation Weiss ("Operation White") (1943) – joint Axis operation againstPartisans throughout occupiedYugoslavia.

• Military campaigns involving Germany
• Invasion of Poland
• Operation Himmler

• Articles with short description
• Short description is different from Wikidata