[Restorer]

Even stretching the definition, I can come up with only eight wars between European states between 1815 and 1914.

Every one, with the exception of the Crimean War, grew out of the German and Italian struggles for unification.

There were many wars during this period, but only a few in Europe.

[muawiyah]

The count is accomplished through the simple expedient of eliminating all wars involving Czarist Russia, or the Ottomans, or the greeks or Spain!

Voila, only 8 wars.