The Slavs and the Old Prussians. Poland in the Early Medieval Period / Славяне и Древние Пруссы. Польша в период Раннего Средневековья.: Poland became independent again in 1918. Polish historiography - historians and archaeologists - were free, too. Even so, during the brief period between the two great wars (1918-1939) many publications continued to draw on theories developed during the