How to use "adversary" in a sentence

Finally, to those nations who would make them-selves our adversary, we offer not a pledge but a request: that both sides begin anew the quest for peace, before the dark powers of destruction unleashed by science engulf all humanity in planned or accidental self-destruction.

He rammed his knee into his adversary's crotch and tore the gun out of the bear-paw hand as those clutching fingers went slack