How about.... Reinstorf is about twelve kilometers east of Lüneburg in Lower Saxony . Neighbouring villages are Wendhausen, Lumber and Horndorf , Sülbeck, New Wendhausen and New Sülbeck, the districts of the municipality are Reinstorf. Independent neighbouring municipalities are Barendorf, Vastorf, Thomas Burg and Neetze from the Ostheide and Scharnebeck and the Hanseatic city of Lüneburg. ("W" would be pronounced as "V" in German and haven/hafen could be a simple phonetic error for hausen....? It doesn't sound far, but in wartime, movement would be restricted to night time which, though longer in winter, would drain their limited energy fairly quickly, so 25 kilometers in 5 days might be just as far as they could safely progress, towards the sound of the guns... Only problem I see is that it is EAST of Luneberg whilst Sudergellersen is west, which is the direction I would expect them to head.... Sounds like you have a New Year assignment to meet up! Merry Christmas, what a lovely present.