Baku sits on one of the richest oilfields on earth, and by 1941 it was supplying most of the fuel keeping the Soviet war machine running. This film traces how that single fact reshaped the Eastern Front, pulling Hitler's planners south toward the Caucasus even as his generals wanted to push straight for Moscow. Historians and archival maps lay out the logic behind Case Blue, the German offensive aimed at the oilfields, and how it funneled troops into the city that gave the campaign its name: Stalingrad. Newsreel footage of burning refineries, tank columns crossing the steppe, and the ruined streets of Stalingrad grounds the strategic argument in the physical cost of the fight. The film treats oil as the hidden logistics story behind one of the war's turning points, tracking supply lines and fuel shortages alongside troop movements. It closes with the Soviet counteroffensive that trapped the German Sixth Army, framed here as a battle that Baku's oil made, one way or another, unavoidable.