From Russia Against Napoleon by Dominic Lieven, 437-438:
'[The area west of Leipzig] is dominated by the rivers Elster and Pleisse, which flow parallel and close together before joining near Leipzig. In 1813 this whole area was a maze of waterways, large and small. Most of the land between the waterways was swampy, and this was particularly so in October, after weeks of rain. The few villages and very few roads in this area were almost islands amidst the swamps and waterways.'
So that is why there was a causeway, a mile and a half long with three bridges, from Leipzig to Lindenau.