Why is is espionage, not spionage?

It appears that the two roots are 'espy' and 'spy'. If you espy something, you just see or notice it. But if you spy on something (someone) you are covert. Yet somehow, the use becomes espionage. Must be a history here somewhere.

Update:

Espy is Victorian English.

Espionage is french.

Now that clears it up!

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