"The era of Bismarck (1861-90) saw the Concert of Europe at its best. In two decades immediately following Germany's rise to the status of a Great Power, she was the chief beneficiary of the peace interest. She had forced her way into the front ranks at the cost of Austria and France; it was to her advantage to maintain the status quo and to prevent a war which could be only a war of revenge against herself. Bismarck deliberately fostered the notion of peace as a common venture of the Powers, and avoided commitments which might force Germany out of the position of a peace Power. He opposed expansionist ambitions in the Balkans or overseas; he used the free trade weapon consistently against Austria, and even against France; he thwarted Russia's and Austria's Balkan ambitions with the help of the balance-of-power game, thus keeping in with potential allies and averting situations which might involve Germany in war. The scheming aggressor of 1863-70 turned into the honest broker of 1878, and the deprecator of colonial adventures. He consciously took the lead in what he felt to be the peaceful trend of the time in order to serve Germany's national interests."