From the arrival of the Huns in the 5th century until the emergence of the principalities of Walachia and Moldavia in the 14th century, the Romanian people virtually disappeared from written history. During this time Romania was invaded by great folk migrations and warriors on horseback who traveled across the Danubian Plain. It is believed that in the face of ceaseless violence the Romanians were forced to relocate, finding safety in the Carpathian Mountains. As military chief Helmuth von Moltke observed: “Resistance having nearly always proven useless, the Romanians could no longer think of any other way of defense than flight.”