Daily Quiz for April 18, 2012

The Battle of Amiens, an allied offensive that resulted in an 11-mile penetration of the German line on a 47-mile front. When the battle opened on August 8, 1918, it caught the Germans by surprise because it was not preceded by the long preliminary bombardments common in all previous battles. The Germans lost 28,000 men and 400 guns, but the attackers sustained heavy tank loses.