3.8M
Axis soldiers
Operation Barbarossa, June 1941 — the largest invasion in history, and the four reasons it became a catastrophe in six months.
Whoever attacks Russia will be destroyed by Russia.Klemens von Metternich, 1820
On 22 June 1941, 3.8 million Axis soldiers crossed the Soviet border along an 1,800-mile front. It was the largest invasion in human history.
Within six months, the Wehrmacht — the most effective army in the world — was stalled at the gates of Moscow, freezing in summer uniforms, losing a winter battle it never expected to fight. Within four years, it would be defeated entirely.
Understanding how this happened is also understanding how the Second World War ended, why the Soviet Union became a superpower, and the limits of even a brilliant army when geography and logistics turn against it.
We have only to kick in the door, and the whole rotten structure will come crashing down.Adolf Hitler, June 1941
The Wehrmacht had crushed France in six weeks. The same playbook — fast armor, encirclement, decisive blows against the enemy's main force — would, they believed, finish the Soviet Union before winter.
Three Army Groups would attack along the front: North, toward Leningrad; Centre, toward Moscow; South, into Ukraine. They expected the Red Army to collapse after the initial blows, the same way the French Army had.
From the Baltic Sea to the Black Sea. For comparison: the Allies' D-Day invasion of Normandy, three years later, was on a 50-mile front. The Eastern Front was 36 times wider — and most of an army that moved at walking speed.
Despite the Panzer mythology, the German Army of 1941 was overwhelmingly powered by horse and foot. This matters more than it sounds — and we'll come back to it.
The Wehrmacht advanced 300 miles in three weeks. Three encirclement battles — Minsk, Smolensk, Kiev — produced one of the most catastrophic losses of any army in modern history.
By the end of September 1941, the Wehrmacht had taken roughly 3 million Soviet prisoners — an army the size of all of France's pre-war military. By any historical measure, the Soviet Union should have collapsed.
It did not. And here the war began to turn.
In late August 1941, Army Group Centre — the army aimed at Moscow — was poised to strike. Hitler instead ordered its main armored force south, to help encircle Kiev. The move netted 600,000 prisoners. It also burned a month at exactly the wrong time of year.
Five weeks in a Russian autumn is the difference between summer war and winter war. The Wehrmacht would discover the difference shortly.
Russian has a specific word for what happens to roads when autumn rain meets the steppe: rasputitsa. The dirt roads, which carried 80% of the Wehrmacht's supplies, become mud so deep that tanks sink to their turrets, horses break legs, and trucks stall in place.
The Wehrmacht advanced almost nothing for three weeks. The window to take Moscow before winter — already narrowed by Kiev — closed.
In a war planned to last 8 weeks, three weeks of mud is the difference between victory and catastrophe.
The Wehrmacht's soldiers were in summer uniforms. The war was supposed to be over by autumn. Wool coats and winter boots had not been ordered, because ordering them would have admitted that the plan might fail.
Tank engines froze and refused to start. Lubricants gelled. Rifle bolts seized. Soldiers got frostbite waiting in line for hot soup. In the first winter of the war, the German Army took more than 100,000 frostbite casualties — many of them permanent disabilities — without firing a shot.
Cold steel doesn't kill you in summer. In Russia, it does.From the diary of a German soldier, January 1942
Two things you might not know about the Eastern Front:
First: Soviet railways used a different gauge (track width) than European railways. As the Wehrmacht advanced, every mile of captured track had to be physically relaid before German trains could use it. The pace of supply was set, in effect, by railway engineering crews — not by Panzer divisions.
Second: every soldier at the front requires several more soldiers behind him to bring food, fuel, ammunition, and replacement equipment. As the army moved deeper into the USSR, the supply tail grew longer, the combat units thinner.
At Moscow's doorstep, the Wehrmacht was — counterintuitively — weaker than it had been at the Soviet border. The army that had crossed the frontier 5 months earlier had effectively burned itself crossing 600 miles.
Through the autumn, Stalin held back the Soviet Far Eastern divisions, fearing a Japanese attack from Manchuria. In October, a Soviet spy in Tokyo confirmed Japan would attack south, not north. Stalin moved those armies — winter-trained, fresh, with new equipment — west to Moscow.
On December 5, 1941, with German troops 15 miles from the Kremlin, the Red Army counter-attacked. The Wehrmacht — out of fuel, freezing, exhausted — broke. They were driven back 100 miles in a month.
The Battle of Moscow was the first strategic defeat of the German Army in the Second World War. The myth of the invincible Wehrmacht — the myth that had won France, Poland, the Low Countries, and Norway — was dead.
The Eastern Front would last another four years. None of them would go better for Germany than 1941.
If you remember nothing else from this lesson, remember these.
A war of decision in eight weeks made sense in France. It was geographically impossible in the Soviet Union. The Wehrmacht's brilliance was tactical; their failure was strategic.
The Wehrmacht's combat units could not be stronger than the supply line behind them. Mud, distance, and the wrong railway gauge defeated the German Army before the Red Army did.
The Soviet Union had two things Hitler did not understand: vast distance, and the willingness to use it. The USSR could trade space for time. Germany could not.
In the launch catalog, every lesson is wired to a small set of others. Here are four that pair with this one.
The next year, the next failure — and the turning point.
The Allies had learned what Barbarossa taught.
A pattern that explains more than one disaster.
Distance is a kind of enemy. So is weather.
Saved to your Notebook. We'll quiz you on this in three days, and again in three weeks — that's how you'll still know it months from now.