World War II: After eight days of brutal house-to-house fighting, the 1st Canadian Infantry Division captured the Italian town of Ortona (pictured).

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.

Urban warfare is warfare in urban areas such as towns and cities. Urban combat differs from combat in the open at both operational and the tactical levels. Complicating factors in urban warfare include the presence of civilians and the complexity of the urban terrain. Urban combat operations may be conducted to capitalize on strategic or tactical advantages associated with the possession or the control of a particular urban area or to deny these advantages to the enemy. It is arguably considered to be the most difficult form of warfare.

The 1st Canadian Division is a joint operational command and control formation based at CFB Kingston, and falls under Canadian Joint Operations Command. It is a high-readiness unit, able to move on very short notice, and is staffed and equipped to meet Canada's military objectives to counter any potential threat.

The Battle of Ortona was fought between two battalions of elite German Fallschirmjäger (paratroops) from the German 1st Parachute Division under Generalleutnant Richard Heidrich, and assaulting Canadian troops from the 1st Canadian Infantry Division under Major General Christopher Vokes. It was the culmination of the fighting on the Adriatic front in Italy during "Bloody December". The battle was known to those who fought it as the "Italian Stalingrad," and as "Little Stalingrad", for the brutality of its close-quarters combat, which was only worsened by the chaotic rubble of the town and the many booby traps used by both sides. The battle took place in the small Adriatic Sea town of Ortona (Abruzzo), with a peacetime population of 10,000.