The Washington Redskins made their biggest free-agent splash Friday night, reaching agreement on a three-year deal with running back Larry Johnson, according to league sources. The contract could be worth up to $12 Million depending upon how Johnson plays, a source told ESPN.com's John Clayton. During his visit to Washington this week, Johnson said he envisioned himself and Clinton Portis being for the Redskins what he and Priest Holmes once were for the Kansas City Chiefs.