diff --git a/src/module/actor/army/data.ts b/src/module/actor/army/data.ts
index 3f0e3a9d664..d9289d6a4d8 100644
--- a/src/module/actor/army/data.ts
+++ b/src/module/actor/army/data.ts
@@ -1,117 +1,202 @@
-import {
-    ActorAttributes,
-    ActorAttributesSource,
-    ActorDetails,
-    ActorDetailsSource,
-    ActorHitPoints,
-    ActorSystemData,
-    ActorSystemSource,
-    ActorTraitsData,
-    ActorTraitsSource,
-    BaseActorSourcePF2e,
-    BaseHitPointsSource,
-} from "@actor/data/base.ts";
-import { ValueAndMax, ValueAndMaybeMax } from "@module/data.ts";
+import { ActorSystemSource, BaseActorSourcePF2e } from "@actor/data/base.ts";
+import { Immunity, ImmunitySource, Resistance, ResistanceSource, Weakness, WeaknessSource } from "@actor/data/iwr.ts";
+import { ActorSystemModel, ActorSystemSchema, ActorTraitsSchema } from "@actor/data/schema.ts";
+import { InitiativeTraceData } from "@actor/initiative.ts";
+import { ActorAlliance } from "@actor/types.ts";
+import { Rarity } from "@module/data.ts";
+import { AutoChangeEntry } from "@module/rules/rule-element/ae-like.ts";
 import { PerceptionTraceData } from "@system/statistic/perception.ts";
-import { Alignment } from "./types.ts";
-import { ARMY_TYPES } from "./values.ts";
-
-type ArmySource = BaseActorSourcePF2e<"army", ArmySystemSource>;
-
-interface ArmySystemSource extends ActorSystemSource {
-    ac: ArmyArmorClass;
-    attributes: ArmyAttributesSource;
-    details: ArmyDetailsSource;
-    traits: ArmyTraitsSource;
-
-    consumption: number;
-    scouting: number;
-    recruitmentDC: number;
-
-    resources: ArmyResourcesSource;
+import { NumberField, SchemaField, StringField } from "types/foundry/common/data/fields.js";
+import { ArmyPF2e } from "./document.ts";
+import { ArmyType } from "./types.ts";
+import { ARMY_STATS, ARMY_TYPES } from "./values.ts";
+
+const fields = foundry.data.fields;
+
+class ArmySystemData extends ActorSystemModel<ArmyPF2e, ArmySystemSchema> {
+    static override defineSchema(): ArmySystemSchema {
+        const parent = super.defineSchema();
+
+        function createWeaponSchema(): ArmyWeaponSchema {
+            return {
+                name: new fields.StringField(),
+                potency: new fields.NumberField({ required: true, nullable: false, initial: 0 }),
+            };
+        }
+
+        return {
+            ...parent,
+            ac: new fields.SchemaField({
+                value: new fields.NumberField({ required: true, nullable: false, initial: ARMY_STATS.ac[1] }),
+                potency: new fields.NumberField({ required: true, nullable: false, initial: 0 }),
+            }),
+            attributes: new fields.SchemaField({
+                hp: new fields.SchemaField({
+                    value: new fields.NumberField({ required: true, nullable: false, initial: 4 }),
+                    temp: new fields.NumberField({ required: true, nullable: false, initial: 0 }),
+                    max: new fields.NumberField({ required: true, nullable: false, initial: 4 }),
+                    routThreshold: new fields.NumberField({ required: true, nullable: false, initial: 2 }),
+                }),
+            }),
+            details: new fields.SchemaField({
+                level: new fields.SchemaField({
+                    value: new fields.NumberField({ required: true, nullable: false, initial: 1 }),
+                }),
+            }),
+            consumption: new fields.NumberField({ required: true, nullable: false, initial: 1 }),
+            scouting: new fields.NumberField({ required: true, nullable: false, initial: ARMY_STATS.scouting[1] }),
+            recruitmentDC: new fields.NumberField(),
+            saves: new fields.SchemaField({
+                maneuver: new fields.NumberField({
+                    required: true,
+                    nullable: false,
+                    initial: ARMY_STATS.strongSave[1],
+                }),
+                morale: new fields.NumberField({ required: true, nullable: false, initial: ARMY_STATS.weakSave[1] }),
+            }),
+            weapons: new fields.SchemaField({
+                melee: new fields.SchemaField(createWeaponSchema()),
+                ranged: new fields.SchemaField(createWeaponSchema()),
+            }),
+            resources: new fields.SchemaField({
+                /** How often this army can use ranged attacks */
+                ammunition: new fields.SchemaField({
+                    value: new fields.NumberField({ required: true, nullable: false, initial: 0 }),
+                }),
+                potions: new fields.SchemaField({
+                    value: new fields.NumberField({ required: true, nullable: false, initial: 0 }),
+                }),
+            }),
+            traits: new fields.SchemaField({
+                value: new fields.ArrayField(new fields.StringField({ required: true, nullable: false })),
+                rarity: new fields.StringField({ required: true, nullable: false, initial: "common" }),
+                type: new fields.StringField({
+                    required: true,
+                    nullable: false,
+                    choices: ARMY_TYPES,
+                    initial: "infantry",
+                }),
+            }),
+        };
+    }
+}
 
-    saves: {
-        maneuver: number;
-        morale: number;
+interface ArmySystemData extends ActorSystemModel<ArmyPF2e, ArmySystemSchema>, ModelPropsFromSchema<ArmySystemSchema> {
+    attributes: ModelPropsFromSchema<ArmyAttributesSchema> & {
+        hp: {
+            max: number;
+            negativeHealing: boolean;
+            unrecoverable: number;
+            details: string;
+        };
+        immunities: Immunity[];
+        weaknesses: Weakness[];
+        resistances: Resistance[];
+        flanking: never;
     };
-
-    weapons: {
-        ranged: ArmyWeaponData | null;
-        melee: ArmyWeaponData | null;
+    initiative: InitiativeTraceData;
+    details: ModelPropsFromSchema<ArmyDetailsSchema> & {
+        alliance: ActorAlliance;
     };
-}
-
-interface ArmyWeaponData {
-    name: string;
-    potency: number;
-}
-
-interface ArmyArmorClass {
-    value: number;
-    potency: number;
-}
-
-interface ArmyTraitsSource extends Required<ActorTraitsSource<string>> {
-    languages?: never;
-    type: (typeof ARMY_TYPES)[number];
-    alignment: Alignment;
-}
-
-interface ArmyDetailsSource extends Required<ActorDetailsSource> {
-    strongSave: string;
-    weakSave: string;
-    description: string;
-}
-
-interface ArmySystemData extends Omit<ArmySystemSource, "attributes">, ActorSystemData {
-    attributes: ArmyAttributes;
-    traits: ArmyTraits;
     perception: Pick<PerceptionTraceData, "senses">;
-    details: ArmyDetails;
-    resources: ArmyResourcesData;
-    saves: ArmySystemSource["saves"] & {
-        strongSave: "maneuver" | "morale";
+    traits: ModelPropsFromSchema<ArmyTraitsSchema> & {
+        size?: never;
     };
+    resources: ModelPropsFromSchema<ArmySystemSchema>["resources"] & {
+        ammunition: { max: number };
+        potions: { max: number };
+    };
+    /** An audit log of automatic, non-modifier changes applied to various actor data nodes */
+    autoChanges: Record<string, AutoChangeEntry[] | undefined>;
 }
 
-interface ArmyAttributesSource extends ActorAttributesSource {
-    immunities?: never;
-    weaknesses?: never;
-    resistances?: never;
-
-    hp: ArmyHitPointsSource;
-    ac: never;
-}
-
-interface ArmyAttributes
-    extends Omit<ArmyAttributesSource, "immunities" | "weaknesses" | "resistances">,
-        ActorAttributes {
-    ac: never;
-    hp: ArmyHitPoints;
-}
-
-interface ArmyHitPointsSource extends Required<BaseHitPointsSource> {
-    /** Typically half the army's hit points, armies that can't be feared have a threshold of 0 instead */
-    routThreshold: number;
-}
-
-interface ArmyHitPoints extends ArmyHitPointsSource, ActorHitPoints {
-    negativeHealing: boolean;
-    unrecoverable: number;
-}
-
-interface ArmyResourcesSource {
-    /** How often this army can use ranged attacks */
-    ammunition: ValueAndMax;
-    potions: ValueAndMaybeMax;
-}
-
-interface ArmyResourcesData extends ArmyResourcesSource {
-    potions: ValueAndMax;
-}
-
-interface ArmyTraits extends Omit<ArmyTraitsSource, "size">, Required<ActorTraitsData<string>> {}
+type ArmySystemSchema = Omit<ActorSystemSchema, "attributes" | "traits" | "resources"> & {
+    ac: SchemaField<{
+        value: NumberField<number, number, true, false, true>;
+        potency: NumberField<number, number, true, false, true>;
+    }>;
+
+    attributes: SchemaField<ArmyAttributesSchema>;
+    details: SchemaField<ArmyDetailsSchema>;
+
+    consumption: NumberField<number, number, true, false, true>;
+    scouting: NumberField<number, number, true, false, true>;
+    recruitmentDC: NumberField;
+
+    saves: SchemaField<{
+        maneuver: NumberField<number, number, true, false, true>;
+        morale: NumberField<number, number, true, false, true>;
+    }>;
+
+    weapons: SchemaField<{
+        ranged: SchemaField<
+            ArmyWeaponSchema,
+            SourceFromSchema<ArmyWeaponSchema>,
+            ModelPropsFromSchema<ArmyWeaponSchema>,
+            false,
+            true
+        >;
+        melee: SchemaField<
+            ArmyWeaponSchema,
+            SourceFromSchema<ArmyWeaponSchema>,
+            ModelPropsFromSchema<ArmyWeaponSchema>,
+            false,
+            true
+        >;
+    }>;
+
+    resources: SchemaField<{
+        /** How often this army can use ranged attacks */
+        ammunition: SchemaField<{
+            value: NumberField<number, number, true, false, true>;
+        }>;
+        potions: SchemaField<{
+            value: NumberField<number, number, true, false, true>;
+        }>;
+    }>;
+
+    traits: SchemaField<ArmyTraitsSchema>;
+};
+
+type ArmyAttributesSchema = {
+    hp: SchemaField<{
+        value: NumberField<number, number, true, false, true>;
+        temp: NumberField<number, number, true, false, true>;
+        max: NumberField<number, number, true, false, true>;
+        routThreshold: NumberField<number, number, true, false, true>;
+    }>;
+};
+
+type ArmyDetailsSchema = {
+    level: SchemaField<{
+        value: NumberField<number, number, true, false, true>;
+    }>;
+};
+
+type ArmyTraitsSchema = ActorTraitsSchema<string> & {
+    rarity: StringField<Rarity, Rarity, true, false>;
+    type: StringField<ArmyType, ArmyType, true, false>;
+};
+
+type ArmyWeaponSchema = {
+    name: StringField;
+    potency: NumberField<number, number, true, false, true>;
+};
+
+type ArmySystemSource = SourceFromSchema<ArmySystemSchema> & {
+    attributes: {
+        immunities?: ImmunitySource[];
+        weaknesses?: WeaknessSource[];
+        resistances?: ResistanceSource[];
+        flanking: never;
+        hp: {
+            details: string;
+        };
+    };
+    /** Legacy location of `MigrationRecord` */
+    schema?: ActorSystemSource["schema"];
+};
 
-interface ArmyDetails extends ArmyDetailsSource, ActorDetails {}
+type ArmySource = BaseActorSourcePF2e<"army", ArmySystemSource>;
 
 export type { ArmySource, ArmySystemData };
diff --git a/src/module/actor/army/document.ts b/src/module/actor/army/document.ts
index 0d221103519..1e538050d85 100644
--- a/src/module/actor/army/document.ts
+++ b/src/module/actor/army/document.ts
@@ -55,6 +55,10 @@ class ArmyPF2e<TParent extends TokenDocumentPF2e | null = TokenDocumentPF2e | nu
         return ARMY_STATS.maxTactics[this.level];
     }
 
+    get strongSave(): "maneuver" | "morale" {
+        return this.system.saves.maneuver >= this.system.saves.morale ? "maneuver" : "morale";
+    }
+
     override prepareData(): void {
         super.prepareData();
         this.kingdom?.notifyUpdate();
@@ -63,13 +67,8 @@ class ArmyPF2e<TParent extends TokenDocumentPF2e | null = TokenDocumentPF2e | nu
     override prepareBaseData(): void {
         super.prepareBaseData();
 
-        // Set certain properties to their default values if omitted
-        this.system.ac.value ??= this._source.system.ac.value ??= ARMY_STATS.ac[this.level];
-        this.system.scouting ??= this._source.system.scouting ??= ARMY_STATS.scouting[this.level];
-
         this.system.details.level.value = Math.clamp(this.system.details.level.value, 1, 20);
         this.system.resources.potions.max = 3;
-        this.system.saves.strongSave = this.system.saves.maneuver >= this.system.saves.morale ? "maneuver" : "morale";
         this.system.perception = { senses: [] };
 
         this.system.details.alliance = this.hasPlayerOwner ? "party" : "opposition";
@@ -155,7 +154,7 @@ class ArmyPF2e<TParent extends TokenDocumentPF2e | null = TokenDocumentPF2e | nu
         // Add statistics for saving throws
         // Note: Kingmaker refers to these as both a type of save (high/low save) but also as "maneuver check"
         for (const saveType of ["maneuver", "morale"] as const) {
-            const table = this.system.saves.strongSave === saveType ? ARMY_STATS.strongSave : ARMY_STATS.weakSave;
+            const table = this.strongSave === saveType ? ARMY_STATS.strongSave : ARMY_STATS.weakSave;
             const baseValue = table[this.level];
             const adjustment = this.system.saves[saveType] - baseValue;
 
@@ -383,7 +382,7 @@ class ArmyPF2e<TParent extends TokenDocumentPF2e | null = TokenDocumentPF2e | nu
         newLevel = Math.clamp(newLevel, 1, 20);
         const currentLevel = this.system.details.level.value;
 
-        const strongSave = this.system.saves.strongSave;
+        const strongSave = this.strongSave;
         const strongSaveDifference = ARMY_STATS.strongSave[newLevel] - ARMY_STATS.strongSave[currentLevel];
         const weakSaveDifference = ARMY_STATS.weakSave[newLevel] - ARMY_STATS.weakSave[currentLevel];
 
diff --git a/src/module/actor/army/types.ts b/src/module/actor/army/types.ts
index 00d17135639..88dfb497787 100644
--- a/src/module/actor/army/types.ts
+++ b/src/module/actor/army/types.ts
@@ -1,6 +1,6 @@
 import { DamageRollFunction, RollFunction } from "@actor/data/base.ts";
-import { ALIGNMENTS } from "./values.ts";
 import { AttackRollParams } from "@system/rolls.ts";
+import { ALIGNMENTS, ARMY_TYPES } from "./values.ts";
 
 type Alignment = SetElement<typeof ALIGNMENTS>;
 
@@ -17,4 +17,6 @@ interface ArmyStrike {
     critical: DamageRollFunction;
 }
 
-export type { Alignment, ArmyStrike };
+type ArmyType = (typeof ARMY_TYPES)[number];
+
+export type { Alignment, ArmyStrike, ArmyType };
diff --git a/src/module/actor/base.ts b/src/module/actor/base.ts
index 76f36505300..25725acb850 100644
--- a/src/module/actor/base.ts
+++ b/src/module/actor/base.ts
@@ -173,7 +173,7 @@ class ActorPF2e<TParent extends TokenDocumentPF2e | null = TokenDocumentPF2e | n
 
     /** The recorded schema version of this actor, updated after each data migration */
     get schemaVersion(): number | null {
-        return Number(this.system._migration?.version ?? this.system.schema?.version) || null;
+        return Number(this.system._migration?.version ?? this._source.system.schema?.version) || null;
     }
 
     /** Get an active GM or, failing that, a player who can update this actor */
diff --git a/src/module/actor/data/base.ts b/src/module/actor/data/base.ts
index cdf31fe96cd..884c0e14b53 100644
--- a/src/module/actor/data/base.ts
+++ b/src/module/actor/data/base.ts
@@ -63,7 +63,7 @@ interface ActorDetailsSource {
     alliance?: ActorAlliance;
 }
 
-interface ActorSystemData extends ActorSystemSource {
+interface ActorSystemData extends Omit<ActorSystemSource, "schema"> {
     abilities?: Abilities;
     details: ActorDetails;
     actions?: StrikeData[];
diff --git a/src/module/actor/data/schema.ts b/src/module/actor/data/schema.ts
new file mode 100644
index 00000000000..a5cb79e0da1
--- /dev/null
+++ b/src/module/actor/data/schema.ts
@@ -0,0 +1,59 @@
+import { ActorPF2e } from "@actor";
+import { ArrayField, NumberField, SchemaField, StringField } from "types/foundry/common/data/fields.js";
+
+const fields = foundry.data.fields;
+
+abstract class ActorSystemModel<TParent extends ActorPF2e, TSchema extends ActorSystemSchema> extends foundry.abstract
+    .TypeDataModel<TParent, TSchema> {
+    static override defineSchema(): ActorSystemSchema {
+        return {
+            _migration: new fields.SchemaField({
+                version: new fields.NumberField({
+                    required: true,
+                    nullable: true,
+                    positive: true,
+                    initial: null,
+                }),
+                previous: new fields.SchemaField(
+                    {
+                        foundry: new fields.StringField({ required: true, nullable: true, initial: null }),
+                        system: new fields.StringField({ required: true, nullable: true, initial: null }),
+                        schema: new fields.NumberField({
+                            required: true,
+                            nullable: true,
+                            positive: true,
+                            initial: null,
+                        }),
+                    },
+                    { required: true, nullable: true, initial: null },
+                ),
+            }),
+        };
+    }
+}
+
+type ActorSystemSchema = {
+    /** The currently selected initiative, as well as initiative trace data */
+    _migration: SchemaField<{
+        version: NumberField<number, number, true, true, true>;
+        previous: SchemaField<
+            {
+                foundry: StringField<string, string, true, true, true>;
+                system: StringField<string, string, true, true, true>;
+                schema: NumberField<number, number, true, true, true>;
+            },
+            { foundry: string | null; system: string | null; schema: number | null },
+            { foundry: string | null; system: string | null; schema: number | null },
+            true,
+            true,
+            true
+        >;
+    }>;
+};
+
+type ActorTraitsSchema<T extends string> = {
+    value: ArrayField<StringField<T, string, true, false>>;
+};
+
+export { ActorSystemModel };
+export type { ActorSystemSchema, ActorTraitsSchema };
diff --git a/static/templates/actors/army/sheet.hbs b/static/templates/actors/army/sheet.hbs
index ffb5fdd9da4..347d12ad620 100644
--- a/static/templates/actors/army/sheet.hbs
+++ b/static/templates/actors/army/sheet.hbs
@@ -12,9 +12,6 @@
                 <select class="tag rarity {{data.traits.rarity}}" data-property="system.traits.rarity">
                     {{selectOptions rarityTraits selected=data.traits.rarity localize=true}}
                 </select>
-                <select class="alignment tag {{data.details.alignment}}" name="system.details.alignment">
-                    {{selectOptions alignments selected=data.details.alignment}}
-                </select>
                 <select name="system.traits.type" class="tag">
                     {{selectOptions armyTypes selected=data.traits.type localize=true}}
                 </select>