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Why did early Christian missionaries fail to convert the Prussians?

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Historical map showing the unification of Germany by Prussia in the late 19th century. The map highlights in green the Kingdom of Prussia as of 1866, and in yellow the additional territories that formed the German Empire by 1871-1918, encompassing most of north-central Europe. Neighboring countries such as France, Belgium, the Netherlands, Denmark, Sweden, Russia, Austria-Hungary, and Switzerland are labeled, with major regions and states within the empire clearly marked. — Prussia The unification of Germany by Prussia, which brought most of north-central Europe into one kingdom.

Early Christian missionary efforts to convert the Prussian tribes, such as those led by Saint Adalbert and Saint Bruno of Querfurt at the turn of the 11th century, were unsuccessful primarily due to the tribes' fierce resistance to Christianity.12

The local tribes in the region were pagan and maintained a long history of resisting missionary efforts, often responding with violence. These tribes, which were ethnically Baltic, lived in a loosely organized society and were deeply committed to their traditional beliefs. It was not until the 13th century that the Teutonic Knights—a military monastic order—successfully subdued and converted the Prussian tribes through a series of military campaigns known as the Prussian Crusades.12