IV

The battles of the Third Army beyond Arras petered out and on June 7th there was the battle of Messines and Wytschaete when the Second Army revealed its mastery of organization and detail. It was the beginning of a vastly ambitious scheme to capture the whole line of ridges through Flanders, of which this was the southern hook, and then to liberate the Belgian coast as far inland as Bruges by a combined sea-and-land attack with shoregoing tanks, directed by the Fourth Army. This first blow at the Messines Ridge was completely and wonderfully successful, due to the explosion of seventeen enormous mines under the German positions, followed by an attack “in depth,” divisions passing through each other, or “leapfrogging,” as it was called, to the final objectives against an enemy demoralized by the earthquake of the explosions.