The Chicago Cubs have claimed right-handed reliever Shawn Armstrong off waivers from the St. Louis Cardinals, where he recently posted a 2.84 ERA in 11 outings. To accommodate Armstrong, the Cubs optioned pitcher Daniel Palencia to Triple-A Iowa and released catcher Tomas Nido, who struggled offensively. Armstrong, a seasoned reliever with a 4.17 career ERA over 291 games, is expected to bolster the Cubs' bullpen as they push for a playoff spot, currently sitting one game ahead of the Cardinals. The Cubs are preparing for roster expansion, which could see the addition of Jordan Wicks as well. Armstrong's acquisition reflects the Cubs' strategy to strengthen their pitching depth during the critical stretch run of the season.