I said in my previous post that the English perhaps wrongfully thought that Finneshâm was an Englsih town...

The town they had in mind was Fincham in the county of Norfolk.
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Historical Notices & Records of the Village & Parish of Fincham in the County of Norfolk" by William Blyth (Rector of Fincham), published by Thew &Son, Kings Lynn, in 1863
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"There are two possible origins for the name Fincham. It most probably derives from Finch + ham, where finch is the common bird, and hammeans home or settlement. An alternative explanation is that the name derives from Fin or Finn, a Saxon family name. Fin, the chief, may have settled in England where the name Finn is still found today. [My local telephone directory in Cambridge lists 6 Finns and 15 Finchams.] There is a village Finningham in Suffolk (ing means family or people).

[Blyth obviously likes this explanation, as it enables him to tell the following story.]

The Saxon epic poem Beowulf (dragon slayer) mentions a battle between the tribe of Finn and another. Later Finn is killed by the Danes, and his village Finnes-ham is plundered. All this is supposed to have taken place in Saxony (i.e Germany). There also exists a fragment of another poem called "The Fight at Finnesham". A recent work [1861, the year before Blyth's own book] suggests that all these events took place in England, and that Finnesham is in fact Fins-ham in Norfolk. The spellings Finsham or Fynsham for Fincham are occasionally found."