This is a pretty simple 2 stage multi. The final is not too far away.
At the posted coordinates, you will find a large stone monument. You will use information from all 4 sides in order to get to the final.
N 45 AB.CDE W 093 FG.HIJ
North Side:
D = The number of Nassig's regiment
E = The last number of the second year at the top of the monument
I = The number of letters in the last word on the top line
South Side:
A = Bies rank - Nielsen rank
C = The second number of Nielsen's regiment
J = The first number of Bies' brigade
East Side:
F = The number of letters in the second word on the fourth line
G = The number of letters in the second word on the last line
West Side:
B = The year at the bottom: The first two numbers added together - the last two numbers added together
H = The year at the bottom: The third number - the first number
You can validate your puzzle solution with certitude.