World War II: German forces begin the Siege of Leningrad.

World War II or the Second World War was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many nations mobilising all resources in pursuit of total war. Tanks and aircraft played major roles, enabling the strategic bombing of cities and delivery of the first and only nuclear weapons ever used in war. World War II is the deadliest conflict in history, causing the death of 70 to 85 million people, more than half of whom were civilians. Millions died in genocides, including the Holocaust, and by massacres, starvation, and disease. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.

The siege of Leningrad was a military blockade undertaken by the Axis powers against the city of Leningrad in the Soviet Union on the Eastern Front of World War II from 1941 to 1944. Leningrad, the country's second largest city, was besieged by Germany and Finland for 872 days, but never captured. The siege was the most destructive in history and possibly the most deadly, causing an estimated 1.5 million deaths, from a prewar population of 3.2 million. It was not classified as a war crime at the time, but some historians have since classified it as a genocide due to the intentional destruction of the city and the systematic starvation of its civilian population.