The sirens will be activated as part of a test and training exercise for the early warning system. A three-minute acoustic “Alarm announcement” signal will be activated at 5:00 p.m., a time known in history as the “W” hour, the hour when the Uprising broke out.
The Warsaw Uprising was the largest armed operation by the Polish underground directed against the German occupier. During the 63 days of fighting, 18,000 insurgents went missing, were killed in action or murdered, while civilian casualties amounted to approximately 180,000 people.