Gathering his strength, he raised the sword with both hands and plunged it into the creature's back.

Have you considered walking up behind him and plunging a knife into his back?

Peter leapt out of the darkness and plunged his knife deep into the man's back.

The warrior moved, and the soldier plunged a knife into his back.

Then she ran forward and plunged the blade into Relph's back.

With a great surge of effort, she plunged the knife into his back.

He expected a saw-toothed blade to be plunged into his back at any moment.

The blade of her knife plunged into his back.

The man behind the captain plunged it into the officer's unguarded back.

He fell and she plunged her sword into his unprotected back.