Early modern Latin grammar (et propterea Leodiensibus instruere se Copiis)

Can anyone tell me what this means (it's only part of a sentence, but I would appreciate any clues):

"et propterea Leodiensibus instruere se Copiis"

Leodiensibus refers to people of Lieges. I'm puzzled by the dative or ablative Copiis. What is its function?
 

Pacifica

grammaticissima
Staff member
Leodiensibus copiis is ablative. The phrase is likely to mean something like literally "and therefore to equip himself/herself/themselves with troops from Liège", i.e. to enlist troops from Liège or something along those lines. Though I can't be 100% sure of the meaning of copiis without context, troops or armed forces seems the most likely at first sight. As context tends to be important for interpretation it's usually a good idea to post at least one complete sentence even if your question concerns only a part of it.
 
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