"The Fourth Coalition fought against Napoleon´s French Empire and were defeated in a war spanning 1806–1807. The main coalition partners were Prussia and Russia with Saxony, ...
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Sweden, and Great Britain also contributing. Excluding Prussia, some members of the coalition had previously been fighting France as part of the Third Coalition, and there was no intervening period of general peace. On 9 October 1806, Prussia joined a renewed coalition, fearing the rise in French power after the defeat of Austria and establishment of the French-sponsored Confederation of the Rhine. Prussia and Russia mobilized for a fresh campaign with Prussia massing troops in Saxony." - (en.wikipedia.org 28.01.2022)
