Michael Bowden appeals following entry of judgment against him in his pro se 42 U.S.C. § 1983 action, in which he claimed that defendants failed to protect him from an assault by other inmates. Upon careful de novo review, we conclude that, for the reasons explained by the district court, 1 the court not err in (1) dismissing three defendants without prejudice based on Bowden’s failure to exhaust his administrative remedies, see 42 U.S.C. § 1997(e); King v. Iowa Dep’t of Corr., 598 F.3d 1051, 1052 (8th Cir. 2010) (standard of review); and (2) granting summary judgment for the remaining two defendants, see Whitson v. Stone Cnty. Jail, 602 F.3d 920, 923 (8th Cir. 2010) (standard of review and elements of failure-to-protect case). Accordingly, we affirm. See 8th Cir. R. 47B.