              United States Court of Appeals
                         For the Eighth Circuit
                     ___________________________

                             No. 12-3546
                     ___________________________

           Union Electric Company, doing business as Ameren UE

                         lllllllllllllllllllll Appellee

                                       v.

                      AEGIS Energy Syndicate 1225

                         lllllllllllllllllllll Appellant
                                ____________

                 Appeal from United States District Court
                   for the Eastern District of Missouri
                             ____________

                         Submitted: April 8, 2013
                          Filed: April 19, 2013
                               [Published]
                             ____________

Before BYE, ARNOLD and BENTON, Circuit Judges.
                          ____________


PER CURIAM.
       AEGIS Energy Syndicate 1225, an insurer, appeals from the denial by the
district court1 of its motion to compel alternative dispute resolution in its dispute with
Union Electric Company (UEC). We affirm.

       UEC purchased an excess insurance policy from AEGIS and filed suit to
recover on the policy after an accident at its Taum Sauk hydroelectric power plant in
Missouri. The main body of the policy prescribes a three-step process to resolve
disputes: first negotiation, then mediation, and last arbitration. One of the provisions
of the policy, Condition M, states: "Any controversy or dispute arising out of or
relating to this ... AEGIS POLICY, or the breach, termination, or validity thereof,
which has not been resolved by non-binding means ... shall be settled by binding
arbitration." The condition also provides that the "Policy shall be governed by the
laws of the state of Missouri." An endorsement to the contract, however, provides:

      Notwithstanding anything contained in this Policy to the contrary, any
   dispute relating to this Insurance or to a CLAIM (including but not limited
   thereto the interpretation of any provision of the Insurance) shall be governed
   by and construed in accordance with the laws of the State of Missouri and each
   party agree [sic] to submit to the jurisdiction of the Courts of the state of
   Missouri.

       In determining whether parties agreed to mandatory arbitration, we apply
"[o]rdinary state law contract principles,"see Keymer v. Management Recruiters Int'l,
Inc., 169 F.3d 501, 504 (8th Cir. 1999), and here we apply Missouri contract law
because the parties agreed in the body of the contract and in the endorsement to
interpret the agreement in accordance with Missouri law. We thus "read the policy
as a whole to determine the parties' intent and give the policy language used its plain
and ordinary meaning." Grissom v. First Nat'l Ins. Agency, 371 S.W.3d 869 (Mo. Ct.

      1
       The Honorable Jean C. Hamilton, United States District Judge for the Eastern
District of Missouri.


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App. 2012). Endorsements, of course, supplant conflicting general provisions in the
main body of a contract. See Abco Tank & Mfg. Co. v. Federal Ins. Co., 550 S.W.2d
193, 198 (Mo. 1977); Hendricks v. Curators of Univ. of Mo., 308 S.W.3d 740, 746
(Mo. Ct. App. 2010). A provision in an insurance "policy is ambiguous if there is
duplicity, indistinctness, or uncertainty in the meaning of the language in the policy,"
and ambiguous provisions are construed against the insurer. Schmitz v. Great Am.
Assur. Co., 337 S.W.3d 700, 706 (Mo. 2011) (internal quotation marks and citation
omitted).

       AEGIS asserts that the endorsement only complements Condition M’s
mandatory arbitration provision. In support of this reading, AEGIS points out that
the endorsement "does not contain any language indicating that it replaces a particular
provision of the contract," as "it does not contain any reference to dispute resolution
procedures generally, arbitration specifically, or any other indication of how policy
disputes are to be resolved" (emphasis in original). AEGIS contends that the
endorsement was meant to give Missouri courts personal jurisdiction over both
parties, and then only to enforce the arbitration provision. It argues that the district
court did not attempt to reconcile the endorsement with the condition, contravening
the general legal principle that courts must give "meaning to all terms and, where
possible, harmonize those terms in order to accomplish the intention of the parties."
See Henges Mfg., LLC v. Amerisure Ins. Co., 5 S.W.3d 544, 545 (Mo. Ct. App. 1999).
In particular, AEGIS maintains that the district court failed to heed the admonition
that "endorsements and language in the body of the policy ... should be construed
together unless they are in such conflict they cannot be reconciled," Shelter Mut. Ins.
Co. v. Sage, 273 S.W.3d 33, 37 (Mo. Ct. App. 2008).

      UEC, on the other hand, maintains that the endorsement’s plain language gives
Missouri courts jurisdiction over all disputes related to the policy, thus replacing the
mandatory arbitration provision, and that in adopting the endorsement the parties
intended to conform the policy to Missouri law, which prohibits mandatory

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arbitration provisions in insurance contracts, see Mo. Ann. Stat. § 435.350; Standard
Sec. Life Ins. Co. of New York v. West, 267 F.3d 821, 824 (8th Cir. 2001) (per
curiam). They point out that AEGIS’s argument that the parties intended the
endorsement to give Missouri courts personal jurisdiction over them for enforcing the
arbitration provision is illogical because a Missouri statute already gives Missouri
courts jurisdiction over AEGIS regarding disputes over its insurance contract, see
Mo. Ann. Stat. § 506.500.1(5), and UEC is, in the words of the district court,
"a Missouri public utility with its headquarters and principal place of business in
St. Louis, Missouri," over which Missouri courts plainly have personal jurisdiction.

       Although AEGIS's proposed interpretation of the endorsement’s language and
the parties’ intent may not be entirely implausible in the abstract, we agree with the
district court that by agreeing in the endorsement "to submit to the jurisdiction of the
Courts of the state of Missouri," AEGIS has agreed to have, in words near the
endorsement’s beginning, "any dispute relating to this Insurance or to a CLAIM"
resolved in those courts. The endorsement thus entirely supplants the condition's
mandatory arbitration provision. And we do not see how the lack of reference in the
endorsement to particular modes of dispute resolution shows that the parties did not
intend to replace the mandatory arbitration provision in the policy; to the contrary, we
think it highly revealing that the endorsement nowhere indicates an intent that the
grant of jurisdiction that it contains refers only to pre- or post-arbitration
enforcement. Even if the policy as a whole were ambiguous as to the mandatory
arbitration, and we think it is not, UEC would still prevail because it would be
entitled to have the ambiguity resolved in its favor, see Schmitz, 337 S.W.3d at 706.

      Affirmed.
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