MOUNT VERNON, Ill. - A commercial general liability insurer had a duty to defend its insureds' faulty workmanship that caused damages sustained by homeowners from a collapsed retaining wall, an Illinois appeals panel affirmed Jan. 23 (Pekin Insurance Co. v. Kiefer Landscaping LLC, et al., No. 5-12-0588, Ill. App., 5th Dist.; 2014 Ill. App. Unpub. LEXIS 107).