Best Answer: Germany went through Belgium in oder to outflank the French armies and quickly capture Paris. The Schlieffen Plan, as it was know, called for this to take 39 days and then for France to declare defeat on day 42, thus ending the threat in the West.o, Germany invaded Belgium in 1914 in order to knock France out of the war quickly, thus avoiding a 2 front war.The major flaw in the plan was that Germany did not think invading Belgium would bring Britain into the war against them. ammianus · 6 years ago. Thumbs up. 4.