This is a military term that means weapons can be fired down the longest axis of an enemy formation.

If you’re at the flank of a firing line, you can fire down the entire line. If you’re in a plane flying along the length of a trench, you can fire entire the trench, following its line.

Why I Looked It Up

In a book about World War 1, I found this:

During the attack they were caught in the enfilade fire of six German machine guns.

This is item #125 in a sequence of 411 items.

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