I tried out DBpedia Spotlight with part of the introduction to "With Fire and Sword":

Now let us see what this western history was. In the middle of the ninth century Slav tribes of various denominations occupied the entire Baltic coast west of the Vistula; a line drawn from Lubeck to the Elbe, ascending the river to Magdeburg, thence to the western ridge of the Bohemian mountains, and passing on in a somewhat irregular course, leaving Carinthia and Styria on the east, gives the boundary between the Germans and the Slavs at that period. Very nearly in the centre of the territory north of Bohemia and the Carpathians lived one of a number of Slav tribes, the Polyane (or men of the plain), who occupied the region afterwards called Great Poland by the Poles, and now called South Prussia by the Germans. In this Great Poland political life among the Northwestern Slavs began in the second half of the ninth century. About the middle of the tenth, Mechislav (Mieczislaw), the ruler, received Christianity, and the modest title of Count of the German Empire. Boleslav the Brave, his son and successor, extended his territory to the upper Elbe, from which region its boundary line passed through or near Berlin, whence it followed the Oder to the sea. Before his death, in 1025, Boleslav wished to be anointed king by the Pope. The ceremony was denied him, therefore he had it performed by bishops at home. About a century later the western boundary was pushed forward by Boleslav Wry-mouth (1132-1139) to a point on the Baltic about half-way between Stettin and Lubeck. This was the greatest extension of Poland to the west. Between this line and the Elbe were Slav tribes; but the region had already become marken (marches) where the intrusive Germans were struggling for the lands and persons of the Slavs.

Corrected:

Now let us see what this western history was. In the middle of the ninth century Slav tribes of various denominations occupied the entire Baltic coast west of the Vistula; a line drawn from Lubeck to the Elbe, ascending the river to Magdeburg, thence to the western ridge of the Bohemian mountains, and passing on in a somewhat irregular course, leaving Carinthia and Styria on the east, gives the boundary between the Germans and the Slavs at that period. Very nearly in the centre of the territory north of Bohemia and the Carpathians lived one of a number of Slav tribes, the Polyane (or men of the plain), who occupied the region afterwards called Great Poland by the Poles, and now called South Prussia by the Germans. In this Great Poland political life among the Northwestern Slavs began in the second half of the ninth century. About the middle of the tenth, Mechislav (Mieczislaw), the ruler, received Christianity, and the modest title of Count of the German Empire. Boleslav the Brave, his son and successor, extended his territory to the upper Elbe, from which region its boundary line passed through or near Berlin, whence it followed the Oder to the sea. Before his death, in 1025, Boleslav wished to be anointed king by the Pope. The ceremony was denied him, therefore he had it performed by bishops at home. About a century later the western boundary was pushed forward by Boleslav Wry-mouth (1132-1139) to a point on the Baltic about half-way between Stettin and Lubeck. This was the greatest extension of Poland to the west. Between this line and the Elbe were Slav tribes; but the region had already become marken (marches) where the intrusive Germans were struggling for the lands and persons of the Slavs.