It was in 1904 that the Great Powers came into conflict. In the beginning of the year, the Japanese demanded the Russians abide by their former agreement to pull out of Manchuria. The Russians, feeling confident in their ability to defeat an Asiatic nation, refused and so began the Russo-Japanese conflict. The Russians over the course of the year suffered defeat after defeat, mostly in the naval arena but on land as well. The other Great Powers tried to remain neutral at first, but the tension was greatly heightened by the war, and the potential alliances that could be activated should even one more power enter the fray.
It was in this climate that the Battle of Dogger Bank became almost inevitable, as in October of 1904 a Russian flotilla heading for the Far East mistakenly thought British vessels were part of a Japanese ambush. This quickly escalated into a full scale naval engagement which the Russians lost. The Russians refused to take responsibility for the action, claiming it was Britain's attempt to sereptitiously aid their ally Japan under the guise of an 'accident'. Russia and Britain entered into a state of war.
With two powers at war with Russia, France and the Ottoman Empire were obliged by treaty to enter into war on behalf of the Russians, which in turn would require the entry into the war of Germany and Austria-Hungary, and so on, as interlocking alliances were tripped by the expansion of the war.
Many in France cheered the announcement of hostilities with chants of 'Alsace-Lorraine!', inflaming the spirit of revanchism in the country.
However, by the end of the year, most of the fighting was still occuring only in Manchuria, and many thought that negotiators would prevail and general war in Europe be avoided.