The Teutonic Knights continued their occupations and captured Pomerania (1308-1309), Chelmno, Kujawa, Dobrzyn, and Kalisz in Poland. Every time Polish land was captured, the population was massacred, and Germans were brought to live in the captured lands. For example, in 1308 when the knights captured Gdansk they killed most of the Polish citizens, about ten thousand in number, and replaced them with German immigrants, who gave them full allegiance. That same year the biggest, most powerful fort in Europe was finished, Malbork - built by the Knights in the occupied Prussian area.
