" With specific reference to the law of insurance, it is considered by standard authority that payment by the insurer, with knowledge of facts to support a policy defense, amounts to a waiver of its right to rely thereupon or to recover the payment made. 16A Appleman, Insurance Law and Practice, ยง 9366, p. 826. Staples v. O'Reilly, Mo.App., 288 S.W.2d 670; National Enameling Stamping Co. v. City of St. Louis, 328 Mo. 648, 40 S.W.2d 593; Baldwin v. Scott County Milling Co., 343 Mo. 915, 122 S.W.2d 890, 895(6), reversed on another ground 307 U.S. 478, 59 S.Ct. 943, 83 L.Ed. 1409, rehearing denied 308 U.S. 631, 60 S.Ct. 65, 84 L.Ed. 526; Ferguson v. Butler County, 297 Mo. 20, 247 S.W. 795, 796(2), 26 A.L.R. 1519; American Brewing Co. v. City of St. Louis, 187 Mo. 367, 86 S.W. 129, 131; Claflin v. McDonough, 33 Mo. 412, 415; R. S. Jacobs Banking Co. v. Federal Reserve Bank, Mo.App., 34 S.W.2d 173, 183(3); Columbia Building Loan Ass'n v. Gill, Mo.App., 285 S.W. 181, 182 (4); Pritchard v. People's Bank of Holcomb, 198 Mo.App. 597, 200 S.W. 665, 666(1). Plaintiff has not undertaken to dispute or contravene the principles of law herein-above noted, either by cited case, text authority or argument.