Eagle was a little strip from the mighty John Severin, that appeared in the last few issues of The Rook, and that probably went completely unnoticed at the time. It's less a story than a brief incident, and can't help but be reminiscent of John's work for Harvey Kurtzman in EC's Two-Fisted Tales.
It also has the slight feel of an unsold newspaper strip, and in fact, in the '50's, Severin had collaborated with writer Colin Dawkins on a similar strip called American Eagle. Maybe this was their attempt to bring the character back.
It's just Severin doing what he did best, and you can never get enough of that.