Not that the conduct of the German Powers was flawless. On January 16, 1864, they sent to Copenhagen a demand for the withdrawal of the constitution for Schleswig within two days. The Danish Foreign Minister pointed out that, as the Rigsraad was not in session, this could not possibly be done within two days. In this last step, then, the German Powers were undoubtedly the aggressors[1]. The Prussian troops were ready near the River Eider, and at once invaded Schleswig. The Danes were soon beaten on the mainland; then a pause occurred, during which a Conference of the Powers concerned was held at London. It has been proved by the German historian, von Sybel, that the first serious suggestion to Prussia that she should take both the Duchies came secretly from Napoleon III. It was in vain that Lord John Russell suggested a sensible compromise, namely, the partition of Schleswig between Denmark and Germany according to the language-frontier inside the Duchy. To this the belligerents demurred on points of detail, the Prussian representative asserting that he would not leave a single German under Danish rule. The war was therefore resumed, and ended in a complete defeat for the weaker State, which finally surrendered both Duchies to Austria and Prussia (1864)[2].
The question of the sharing of the Duchies now formed one of the causes of the far greater war between the victors; but, in truth, it was only part of the much larger question, which had agitated Germany for centuries, whether the balance of power should belong to the North or the South. Bismarck also saw that the time was nearly ripe for settling this matter once for all in favour of Prussia; but he had hard work even to persuade his own sovereign; while the Prussian Parliament, as well as public opinion throughout Germany, was violently hostile to his schemes and favoured the claims of the young Duke of Augustenburg to the Duchies--claims that had much show of right. Matters were patched up for a time between the two German States, by the Convention of Gastein (August 1865), while in reality each prepared for war and sought to gain allies.
Here again Bismarck was successful. After vainly seeking to buy Venetia from the Austrian Court, Italy agreed to side with Prussia against that Power in order to wrest by force a province which she could not hope to gain peaceably. Russia, too, was friendly to the Court of Berlin, owing to the help which the latter had given her in crushing the formidable revolt of the Poles in 1863. It remained to keep France quiet. In this Bismarck thought he had succeeded by means of interviews which he held with Napoleon III. at Biarritz (Nov. 1865). What there occurred is not clearly known. That Bismarck played on the Emperor's foible for oppressed nationalities, in the case of Italy, is fairly certain; that he fed him with hopes of gaining Belgium, or a slice of German land, is highly probable, and none the less so because he later on indignantly denied in the Reichstag that he ever "held out the prospect to anybody of ceding a single German village, or even as much as a clover-field." In any case Napoleon seems to have promised to observe neutrality--not because he loved Prussia, but because he expected the German Powers to wear one another out and thus leave him master of the situation. In common with most of the wiseacres of those days he believed that Prussia and Italy would ultimately fall before the combined weight of Austria and of the German States, which closely followed her in the Confederation; whereupon he could step in and dictate his own terms[3].
Bismarck and the leaders of the Prussian army had few doubts as to the result. They were determined to force on the war, and early in June 1866 brought forward proposals at the Frankfurt Diet for the "reform" of the German Confederation, the chief of them being the exclusion of Austria, the establishment of a German Parliament elected by manhood suffrage, and the formation of a North German army commanded by the King of Prussia.
A great majority of the Federal Diet rejected these proposals, and war speedily broke out, Austria being supported by nearly all the German States except the two Mecklenburgs.
The weight of numbers was against Prussia, even though she had the help of the Italians operating against Venetia. On that side Austria was completely successful, as also in a sea-fight near Lissa in the Adriatic; but in the north the Hapsburgs and their German allies soon found out that organisation, armament, and genius count for more than numbers. The great organiser, von Roon, had brought Prussia's citizen army to a degree of efficiency that surprised every one; and the quick-firing "needle-gun" dealt havoc and terror among the enemy. Using to the full the advantage of her central position against the German States, Prussia speedily worsted their isolated and badly-handled forces, while her chief armies overthrew those of Austria and Saxony in Bohemia. The Austrian plan of campaign had been to invade Prussia by two armies--a comparatively small force advancing from Cracow as a base into Silesia, while another, acting from Olmütz, advanced through Bohemia to join the Saxons and march on Berlin, some 50,000 Bavarians joining them in Bohemia for the same enterprise. This design speedily broke down owing to the short-sighted timidity of the Bavarian Government, which refused to let its forces leave their own territory; the lack of railway facilities in the Austrian Empire also hampered the moving of two large armies to the northern frontier. Above all, the swift and decisive movements of the Prussians speedily drove the allies to act on the defensive--itself a grave misfortune in war.
Meanwhile the Prussian strategist, von Moltke, was carrying out a far more incisive plan of operations--that of sending three Prussian armies into the middle of Bohemia, and there forming a great mass which would sweep away all obstacles from the road to Vienna. This design received prompt and skilful execution. Saxony was quickly overrun, and the irruption of three great armies into Bohemia compelled the Austrians and their Saxon allies hurriedly to alter their plans. After suffering several reverses in the north of Bohemia, their chief array under Benedek barred the way of the two northern Prussian armies on the heights north of the town of Königgrätz. On the morning of July 3 the defenders long beat off all frontal attacks with heavy loss; but about 2 P.m. the Army of Silesia, under the Crown Prince Frederick of Prussia, after a forced march of twelve miles, threw itself on their right flank, where Benedek expected no very serious onset. After desperate fighting the Army of Silesia carried the village of Chlum in the heart of the Austrian position, and compelled Austrians and Saxons to a hurried retreat over the Elbe. In this the Austrian infantry was saved from destruction by the heroic stand made by the artillery. Even so, the allies lost more than 13,000 killed and wounded, 22,000 prisoners, and 187 guns[4].
Königgrätz (or Sadowa, as it is often called) decided the whole campaign. The invaders now advanced rapidly towards Vienna, and at the town of