OPINION

GWIN, District Judge:

On November 2, 2009, appellants Father Stephen Kelly, Lynne Greenwald, Father William Bichsel, Susan Crane, and Sister Anne Montgomery — in an act of symbolic protest against nuclear weapons — cut their way through two fences and into a secure area of United States Naval Base Kitsap-Bangor, near Seattle. All are longtime peace and disarmament activists. Two are Catholic priests, and one is an eighty-year-old Catholic nun. Two others are grandmothers.

Once inside, the group spread "simulated blood" on base fences and unfurled a banner reading, "Plowshares — Trident Illegal and Immoral." (Although the government is tight-lipped about Kitsap-Bangor's mission, appellants say the base houses submarines carrying nuclear-warhead-tipped Trident missiles.) Shortly afterwards, Marines detained the protestors. The United States later initiated this criminal prosecution.

A jury convicted appellants of conspiracy to trespass, to destroy property within the special territorial jurisdiction of the United States, and to injure property of the United States having a value exceeding $1,000, violating 18 U.S.C. § 371. The jury also separately convicted appellants of the underlying trespass, violating 18 U.S.C. § 1382; destruction of property (i.e., the fences) within the special territorial jurisdiction of the United States, violating 18 U.S.C. § 1363; and injuring property of the United States with a value exceeding $1,000, violating 18 U.S.C. § 1361.

On appeal, appellants challenge the district court's refusal to dismiss the indictment. They argue that international law preempts 18 U.S.C. §§ 1361, 1363, and 1382. They similarly argue that the district erred when it refused to instruct the jury on their international-law defense. Finally, they challenge the district court's jury-instruction definition of the statutory term "maliciously," as used in 18 U.S.C. § 1363, and the sufficiency of the government's evidence that appellants' conduct was "malicious." We affirm.

I.

Before trial, appellants moved to dismiss the indictment, arguing, among other things, that the 1907 Hague Convention Respecting the Laws and Customs of War on Land and its Annex, Oct. 18, 1907, 36 Stat. 2277 (the Hague Convention), supersedes or abrogates 18 U.S.C. §§ 1361, 1363, and 1382. The United States ratified the treaty in 1909.1 The district court denied the motion. Later, at the government's request, the district court prohibited appellants from "put[ting] into evidence or argu[ing] the application of international law" at trial.

Appellants now renew their argument that the Hague Convention, which "prohibit[s]" the "attack or bombardment" of "undefended" towns and "especially forbid[s]" the "employ[ment of] arms, projectiles, or material calculated to cause unnecessary suffering," 36 Stat. at 2301-02, conflicts with the United States laws prohibiting the destruction of government property, at least when the government uses that property to protect nuclear weapons. Accordingly, the argument goes, the Hague Convention supersedes §§ 1361, 1363, and 1382, and requires dismissal of the indictment. Appellants are incorrect.

Whether a treaty supersedes a domestic criminal statute is a legal question, requiring de novo review. The Supreme Court "has long recognized the distinction between treaties that automatically have effect as domestic law, and those that — while they are international law commitments — do not by themselves function as binding federal law." Medellin v. Texas, 552 U.S. 491, 504, 128 S.Ct. 1346, 170 L.Ed.2d 190 (2008). "[A] treaty is equivalent to an act of the legislature, and hence self-executing, when it operates of itself without the aid of any legislative provision." Id. at 505, 128 S.Ct. 1346 (internal quotation marks omitted). "Only if the treaty contains stipulations which are self-executing, that is, require no legislation to make them operative, will they have the force and effect of a legislative enactment." Id. at 505-06, 128 S.Ct. 1346 (alterations and internal quotation marks omitted).

Had we any need, we might conclude that the relevant articles of the Hague Convention are not self-executing and, therefore, have no "force [or] effect" on any other federal law. Id. (internal quotation marks omitted). Although those articles contain express "prohibitions," Article 1 of the Convention contemplates that the contracting parties will, after ratification, "issue instructions to their armed land forces which shall be in conformity with the Regulations respecting the Laws and Customs of War on Land, annexed to the present Convention." Hague Convention, art. 1, 36 Stat. 2290. This anticipatory language suggests the parties would take later, individual steps to carry out the Convention's directives, rather than to give the Convention itself domestic legal effect. See Goldstar (Panama) S.A. v. United States, 967 F.2d 965, 968-69 (4th Cir.1992) ("[T]he Hague Convention is not self-executing,... instead, the signatories contemplated that individual nations would take subsequent executory actions to discharge the obligations of the treaty."); see also Islamic Republic of Iran v. Boeing Co., 771 F.2d 1279, 1283 (9th Cir.1985) ("[T]he purposes of the treaty and the objectives of its creators.... is the [] factor that is critical to determine whether an executive agreement is self executing...." (emphasis and internal quotation marks omitted)); 18 U.S.C. § 2441 (punishing the commission of a "war crime," including "any conduct ... prohibited by Article 23, 25, 27, or 28 of the Annex to the Hague Convention IV, Respecting the Laws and Customs of War on Land....").

Nevertheless, we need not decide whether the Hague Convention is self-executing because even if it is, it has only equal footing with other federal laws, see Whitney v. Robertson, 124 U.S. 190, 193-94, 8 S.Ct. 456, 31 L.Ed. 386 (1888), and where a treaty conflicts with another federal law, the more recent of the two controls, see Cook v. United States, 288 U.S. 102, 118-19, 53 S.Ct. 305, 77 L.Ed. 641 (1933). Even supposing the Hague Convention is self-executing, it became law in the United States in 1909, well before the first United States Code codifications of §§ 1361, 1363, and 1382. See 62 Stat. 683, 764-65 ("revis[ing], codif[ying], and enact[ing] into positive law" 18 U.S.C. §§ 1361, 1363, 1382). Furthermore, Congress has periodically modified those statutes; § 1361 most recently in October 1996, 110 Stat. 3498, 3510-11; § 1363 most recently in October 2001, 115 Stat. 381; and § 1382 most recently in September 1994, 108 Stat. 2147. Accordingly, to the extent the Hague Convention conflicts with those federal criminal statutes, the later-modified statutes supersede the treaty.

Moreover, the treaty-statute conflict appellants suggest is illusory. The relevant Hague Convention articles are found in Section II, entitled "HOSTILITIES," Chapter I, entitled "Means of injuring the enemy, sieges, and bombardments," and provide: (1) that "it is especially forbidden... [to] employ arms, projectiles, or material calculated to cause unnecessary suffering," art. 23(e), 36 Stat. at 2301-02 (emphasis supplied); and (2) that "[t]he attack or bombardment, by whatever means, of towns, villages, dwellings, or buildings which are undefended is prohibited," art. 25, 36 Stat. at 2302 (emphasis supplied). The "natural reading" of these provisions, see Medellin, 552 U.S. at 507, 128 S.Ct. 1346, is that the Hague Convention prohibits the use of certain weapons in "armed conflicts between nations," i.e., "war," 36 Stat. at 2279. See 5 Oxford English Dictionary 190 (2d ed. 1998) (To "employ" means "[t]o apply (a thing) to some definite purpose; to use as a means or instrument, or as material.").

So if nuclear weapons are weapons "calculated to cause unnecessary suffering," the Hague Convention prohibits their "employ[ment]" as a "[m]eans of injuring the enemy...." 36 Stat. at 2301-02. The Hague Convention does not explicitly prohibit mere possession (and enclosure within fencing) of such weapons.

In the end, Congress has decided to protect the property of the United States. The Hague Convention neither conflicts with nor supersedes those statutes. The district court properly refused to dismiss the indictment.2

II.

Appellants' remaining arguments address their convictions for "willfully and maliciously" destroying or injuring "any structure, conveyance, or other real or personal property" within the special maritime and territorial jurisdiction of the United States. 18 U.S.C. § 1363. They argue that the district court improperly instructed the jury on the meaning of the term "maliciously" as used in 18 U.S.C. § 1363. Relatedly, appellants argue that the government offered insufficient evidence to establish that they acted maliciously when they damaged the property at the naval base.

In its instructions to the jury, the district court defined "maliciously" as "wrongfully and without legal justification or excuse." In defining maliciously, the district court used the first-sense definition of "malice" found in Black's Law Dictionary. See Black's Law Dictionary 1042 (9th ed. 2009) (defining "malice" as "[t]he intent, without justification or excuse, to commit a wrongful act."). Appellants contend that "maliciously" means something more — in particular, that it means "had an evil intent" or "had wicked or mischievous intentions."3 Accordingly, they say, the jury instructions were inaccurate and the evidence of their guilt insufficient. Considering the meaning of § 1363 de novo, we disagree.

When, as here, "a statute does not define a term, we generally interpret that term by employing the ordinary, contemporary, and common meaning of the words that Congress used." United States v. Iverson, 162 F.3d 1015, 1022 (9th Cir. 1998). For terms that "have accumulated settled meaning under ... the common law," however, "a court must infer, unless the statute otherwise dictates, that Congress means to incorporate the established meaning of these terms." NLRB v. Amax Coal Co., 453 U.S. 322, 329, 101 S.Ct. 2789, 69 L.Ed.2d 672 (1981); see also Neder v. United States, 527 U.S. 1, 21-22, 119 S.Ct. 1827, 144 L.Ed.2d 35 (1999).

As this court has previously recognized in a similar context, the term "maliciously" had a particular meaning at common law. See United States v. Doe, 136 F.3d 631, 634-35 (9th Cir.1998) (interpreting the term "willfully and maliciously" in the federal arson statute, 18 U.S.C. § 81);4 see also Murray v. Bammer (In re Bammer), 131 F.3d 788, 791 (9th Cir.1997) (interpreting the term "malicious" in § 523(a)(6) of the Bankruptcy Code). Accordingly, we infer that Congress's use of the term in § 1363 was a nod to the common law.5

At common law, "malice" was a necessary component of the mental state for a variety of offenses — "murder, mayhem, arson, libel and malicious mischief." Rollin M. Perkins & Ronald N. Boyce, Criminal Law 856 (3d ed. 1982). And "an intent to cause the particular harm involved in the crime in question, without justification, excuse or mitigation, [was] sufficient to meet the mens-rea requirement of such offenses." Id. at 857. Which is to say, "in the absence of justification, excuse or recognized mitigation, it is malicious to intend to do what constitutes the actus reus of the crime in question." Id.6

Nevertheless, the common-law definition of malice clearly recognized "the non-necessity of any element of hatred, spite, grudge, or ill-will." Perkins & Boyce, Criminal Law 857; see also In re Bammer, 131 F.3d at 791 (Malice "does not require a showing of biblical malice, i.e., personal hatred, spite, or ill-will."); 4 Charles E. Torcia, Wharton's Criminal Law § 470 (15th ed. 2011) ("[M]alice in the traditional legal sense" does not require "that the defendant harbor ill will toward the [property] owner." (footnote omitted)); 3 id. § 337 ("[M]alice in a literal sense is not required; a defendant may act maliciously even though he harbors no `malevolence or ill-will' toward the owner or occupant."). It was sufficient that the defendant (1) had the intent to do the prohibited act and (2) had no justification or excuse.

For our purposes, the particular harm produced by a violation of § 1363 is the "destr[uction] or injur[y of] any structure, conveyance, or other real or personal property" within the federal government's jurisdiction. Accordingly, a defendant violates that section when he willfully acts, intending to destroy or injure any such property, and has no legal justification or excuse for his action.

Consistent with the common-law definition of malice, the government need not prove that the defendant harbored any "[i]ll will" or "wickedness of heart," Black's Law Dictionary 1042 (9th ed. 2009) (defining "malice" in the "nonlegal" sense); even defendants who genuinely believe that their intentional, unlawful actions are consistent with "the conscience of the people," as appellants put it, are guilty.7 See Wayne R. LaFave, Substantive Criminal Law § 5.3 (2d ed. 2011) ("One who intentionally destroys a fence around a graveyard without the owner's consent is guilty of ... malicious mischief ..., though he destroys the fence with the praiseworthy motive of building a better fence." (citing Phillips v. State, 29 Tex. 226 (1867))).

* * *

The jury instructions here accurately presented the law to the jury. According to those instructions, the jury could convict appellants for violating § 1363 only if the jury found by proof beyond a reasonable doubt that, among other things, appellants "willfully destroyed any real property" and that they "acted maliciously, that is, wrongfully and without legal justification or excuse." Taken together, see United States v. Park, 421 U.S. 658, 674, 95 S.Ct. 1903, 44 L.Ed.2d 489 (1975), those instructions permitted the jury to convict only upon its finding that appellants cut the base fences with the intent to destroy them and without any legal justification. Considering the common-law definition of "maliciously," the law required nothing more.

Moreover, the evidence was sufficient to establish that appellants willfully and maliciously destroyed the fences. By their own account, appellants cut holes in the fences to enter the base. Relying on that fact alone, the jury could easily have found beyond a reasonable doubt that appellants cut the fences intending to destroy or injure them. See 18 U.S.C. § 1363. Accordingly, appellants' convictions are

AFFIRMED.