What are examples of Bismarck's use of realpolitik?

1. He showed the use of Realpolitik when he ignored Parliament with the passing of military budget.

2. Bismarck made an alliance with Austria, then they both seized land from Denmark. After a brief war, both countries "liberated" the two provinces and split the spoils. Then Persia found an excuse to attack Austria and was victories then he dissolved Austria led German Confederation and replaced it with a new confederation dominated by Prussia. Which shows that he used Realpolitik to make and break alliances for his countries needs at the moment.

3. France declares war on Prussia was a war that even when he is the one getting declared war on that he can use Realpolitik to get his alliances with other German countries to help defeat the French's badly organized and poorly supplied troops.