On 1 August, Wilhelm ordered General Helmuth von Moltke the Younger to "march the whole of the army to the East" after being wrongly informed that the British would remain neutral if France was not attacked. Moltke told the Kaiser that attempting to redeploy a million men was unthinkable, and that making it possible for the French to attack the Germans "in the rear" would prove disastrous. Yet Wilhelm insisted that the German army should not march into Luxembourg until he received a telegram sent by his cousin George V, who made it clear that there had been a misunderstanding. Eventually the Kaiser told Moltke, "Now you can do what you want."
Russian plans for the start of the war called for simultaneous invasions of Austrian Galicia and East Prussia. Although Russia's initial advance into Galicia was largely successful, it was driven back from East Prussia by Hindenburg and Ludendorff at the battles of Tannenberg and the Masurian Lakes in August and September 1914.
On 3 August Germany declared war on France; on the same day, they sent the Belgian government an ultimatum demanding unimpeded right of way through any part of Belgium, which was refused. Early on the morning of 4 August, the Germans invaded; King Albert ordered his military to resist and called for assistance under the 1839 Treaty of London.
On 10 August, German forces in South-West Africa attacked South Africa; sporadic and fierce fighting continued for the rest of the war. The German colonial forces in German East Africa, led by Colonel Paul von Lettow-Vorbeck, fought a guerrilla warfare campaign during World War I and only surrendered two weeks after the armistice took effect in Europe.
The Battle of Cer was a military campaign fought between Austria-Hungary and Serbia in August 1914, starting three weeks into the Serbian Campaign, the initial military action of the First World War. It took place around Cer Mountain and several surrounding villages, as well as the town of Šabac. The battle was a part of the first Austro-Hungarian invasion of Serbia, began on the night of 15 August when elements of the Serbian 1st Combined Division encountered Austro-Hungarian outposts that had been established on the slopes of Cer Mountain earlier in the invasion. The clashes that followed escalated into a battle for control over several towns and villages near the mountain, especially Šabac.
De Gaulle was involved in fierce fighting from the outset As a platoon commander, He received his baptism of fire on 15 August and was among the first to be wounded, receiving a bullet in the knee at the Battle of Dinant.
The initial German advance in the West was very successful: by the end of August the Allied left, which included the British Expeditionary Force (BEF), was in full retreat; French casualties in the first month exceeded 260,000, including 27,000 killed on 22 August during the Battle of the Frontiers.
In August 1914, Garvey attended a meeting of the Queen Street Baptist Literary and Debating Society, where he met Amy Ashwood, recently graduated from the Westwood Training College for Women. She joined UNIA and rented a better premises for them to use as their headquarters, secured using her father's credit. She and Garvey embarked on a relationship, which was opposed by her parents. In 1915 they secretly became engaged. When she suspended the engagement, he threatened to commit suicide, at which she resumed it.
Because mighty Russia support Serbia, and that will be a real threat, Austria-Hungary to declare war until its leaders reserved assurance from a great ally, German leader Kaisar Wilhelm II that Germany will support them. Austrian leaders had fear that Russian intervention will involve others, France and possibly Great Britain as well.