AP® European History · Unit 8 · Topic 8.2
Why the Western Front Stopped Moving
The Western Front stopped moving because defensive weapons like machine guns and barbed wire made attacking deadly, and failed attempts to outflank the enemy stretched a continuous fortified line from Switzerland to the Channel, leaving no open ground left to maneuver around.
Germany's Schlieffen Plan called for a fast, wide sweep through Belgium into northern France, knocking out France in about six weeks before turning east to face Russia. The plan depended on speed, but Belgian resistance, logistical strain, and a French and British counterattack at the Marne in September 1914 stopped the German advance short of Paris. Neither side could break through, so both tried to go around the other's exposed flank by extending their lines north. This race to the sea ran out of room at the Belgian coast, and by late 1914 a continuous trench system stretched roughly 475 miles from the Swiss border to the English Channel, with no open flank left for anyone to turn.
Once that line existed, attacking it became suicidal. Defenders behind barbed wire, in dug-in trenches, with machine guns sighted across open ground, could cut down advancing infantry faster than attackers could cross no man's land, the shredded, shell-cratered space between opposing trenches. Artillery barrages meant to clear the wire and crush the defenders usually just churned the ground and announced the attack. The Battle of the Somme, July to November 1916, captured about seven miles after roughly a million combined casualties, showing how little ground even enormous offensives bought.
The Eastern Front, fought with the same rifles, machine guns, and artillery, avoided this deadlock because the front there ran far longer relative to the troops available to hold it. Armies could not build a continuous fortified line, so gaps and open flanks remained, letting Germany and Russia maneuver and gain or lose large stretches of territory in ways the Western Front never allowed.
Key terms
- Schlieffen Plan
- Germany's pre-war strategy to defeat France quickly through a sweep via Belgium before turning to fight Russia.
- Race to the Sea
- The mutual attempts by German and Allied forces to outflank each other by extending their lines north to the coast.
- No man's land
- The shell-torn, exposed ground between opposing trenches that attacking infantry had to cross under fire.
- Western Front
- The fortified line of trenches running from Switzerland to the Channel where fighting stalemated for most of the war.
- Eastern Front
- The much longer front between Germany and Russia, too long to fortify continuously, which allowed mobile warfare.
Watch it explained
- How it worksShow me the Schlieffen Plan's intended sweep next to where the German army actually stopped.
- How it worksHow does the race to the sea end with a continuous trench line from Switzerland to the Channel?
- How it worksWalk me through what happens to infantry crossing no man's land against machine guns and wire.
- Worked exampleTrace the ground gained and the casualties taken at the Somme between July and November 1916.
- Going furtherWhat changed on the Eastern Front where the same weapons produced movement instead of deadlock?
Check yourself
End of topic.