Decoding of the number 5.91. Year is indicated almost explicitly. If 1 to put between 59, then by swapping these numbers we get 1915 – the year of secret agreement.

Quatrain 6.43 Battle of the Marne

Long temps sera sans estre habitee,

Ou Seine & Marne autour vient arrouser

De la Tamise & martiaux temptee,

Deceus les gardes en cuidant repousser.

For a long time will it remain uninhabited,

Around where the Seine and the Marne she comes to water:

Tried by the Thames and warriors,

The guards deceived in trusting in the repulse.

During the First World War on the Marne were 2 large battles in 1914 and 1918 between the forces of the Entente and Germany. The Germans were defeated. However, to the French, these victories were worth huge losses. After the war the territory between the Seine and Marne entered the "red zone", that is i.t became unusable neither for the forest, nor for .any other activity.

The translation of 3 and 4 lines is very doubtful. Perhaps Nostradamus predicted Britain's participation in the First World War.

Quatrain 3.58[3] Will be born a great