Trying my hardest to keep this thread moving and relevant...the July/August period was a very busy time in 1914!
So, on this date (4 Aug), Germany declared war on and invaded Belgium. England then declared war on Germany--the kicker was the German violation of Belgium's neutrality. This act basically galvanized the French, English, and (of course) the Belgians against Germany. From what little I know on the topic, the Germans tried their hardest to goad the French into entering Belgium first, thereby giving Germany the moral high ground. The French president, however, ordered his troops to withdraw 10 kilometers from the Belgian border, so that there would be no question as to who first violated Belgian neutrality. The Germans had even fabricated stories of French patrols crossing the border into Germany, and of French aircraft dropping bombs on German soil--all of which was untrue.
Some years later, according to a passage in Barbara Tuchman's The Guns of August, the Crown Prince of (I believe) Germany referred to 4 August as "the day when we Germans lost the first great battle in the eyes of the world."
Tomorrow, 5 August, marks the Battle of Liege in Belgium, the first true battle of the First World War. The Germans hoped and expected the Belgian military to roll over, as they were woefully outnumbered; but, they fought.
Prophetically, Helmuth von Moltke--the German chief of staff--wrote to Conrad von H