Online: Rapid Wien - Wisła Kraków (01.08.2024), "W" - Hour by Wisła Kraków on way to Vienna ("W" Hour, also spelled as W-Hour (Polish: Godzina „W”'), was the codename for the date and time that began Operation Tempest in German-occupied Warsaw, and hence the Warsaw Uprising. The exact time was 5:00 PM on 1 August 1944)