diff --git a/src/scripts/generation/pack/burgsAndStates/defineStateForm.ts b/src/scripts/generation/pack/burgsAndStates/defineStateForm.ts
index 67f27d9e..0610edd0 100644
--- a/src/scripts/generation/pack/burgsAndStates/defineStateForm.ts
+++ b/src/scripts/generation/pack/burgsAndStates/defineStateForm.ts
@@ -28,11 +28,11 @@ export function defineStateForm(
   areaTier: AreaTiers,
   nameBase: number,
   burgsNumber: number,
-  relations: TRelation[],
-  neighbors: number[]
+  neighbors: number[],
+  isVassal: boolean
 ) {
   const form = defineForm(type, areaTier);
-  const formName = defineFormName(form, nameBase, areaTier, burgsNumber, relations, neighbors);
+  const formName = defineFormName(form, nameBase, areaTier, burgsNumber, neighbors, isVassal);
 
   return {form, formName};
 }
@@ -59,10 +59,10 @@ function defineFormName(
   nameBase: number,
   areaTier: AreaTiers,
   burgsNumber: number,
-  relations: TRelation[],
-  neighbors: number[]
+  neighbors: number[],
+  isVassal: boolean
 ) {
-  if (form === "Monarchy") return defineMonarchyForm(nameBase, areaTier, relations, neighbors);
+  if (form === "Monarchy") return defineMonarchyForm(nameBase, areaTier, neighbors, isVassal);
   if (form === "Republic") return defineRepublicForm(areaTier, burgsNumber);
   if (form === "Union") return rw(StateForms.union);
   if (form === "Theocracy") return defineTheocracyForm(nameBase, areaTier);
@@ -72,10 +72,9 @@ function defineFormName(
 }
 
 // Default name depends on area tier, some name bases have special names for tiers
-function defineMonarchyForm(nameBase: number, areaTier: AreaTiers, relations: TRelation[], neighbors: number[]) {
+function defineMonarchyForm(nameBase: number, areaTier: AreaTiers, neighbors: number[], isVassal: boolean) {
   const form = StateForms.monarchy[areaTier];
 
-  const isVassal = relations.includes("Vassal");
   if (isVassal) {
     if (areaTier === AreaTiers.DUCHY && neighbors.length > 1 && rand(6) < neighbors.length) return "Marches";
     if (nameBase === NAMEBASE.English && P(0.3)) return "Dominion";
diff --git a/src/scripts/generation/pack/burgsAndStates/generateConflicts.ts b/src/scripts/generation/pack/burgsAndStates/generateConflicts.ts
new file mode 100644
index 00000000..46bfeba0
--- /dev/null
+++ b/src/scripts/generation/pack/burgsAndStates/generateConflicts.ts
@@ -0,0 +1,158 @@
+import * as d3 from "d3";
+
+import {TIME} from "config/logging";
+import {list, trimVowels} from "utils/languageUtils";
+import {gauss, ra} from "utils/probabilityUtils";
+
+export function generateConflicts(states: IState[]) {
+  TIME && console.time("generateConflicts");
+
+  const statesMap = new Map(states.map(state => [state.i, state]));
+  const wars: IConflict[] = [];
+
+  for (const {i: stateId, relations} of states) {
+    if (!relations.includes("Rival")) continue; // no rivals to attack
+    if (relations.includes("Vassal")) continue; // not independent
+    if (relations.includes("Enemy")) continue; // already at war
+
+    // select candidates to attack: rival independent states
+    const candidates = relations
+      .map((relation, stateId) => {
+        const state = statesMap.get(stateId);
+        const isVassal = state?.relations.includes("Vassal");
+        return relation === "Rival" && state && !isVassal ? stateId : 0;
+      })
+      .filter(index => index);
+    if (!candidates.length) continue;
+
+    const attacker = statesMap.get(stateId);
+    const defender = statesMap.get(ra(candidates));
+    if (!attacker || !defender) continue;
+
+    const attackerPower = getStatePower(attacker);
+    const defenderPower = getStatePower(defender);
+    if (attackerPower < defenderPower * gauss(1.6, 0.8, 0, 10, 2)) continue; // defender is too strong
+
+    const war = simulateWar(attacker, defender);
+    wars.push(war);
+  }
+
+  TIME && console.timeEnd("generateConflicts");
+  return wars;
+
+  function simulateWar(attacker: IState, defender: IState): IConflict {
+    const history = [`${attacker.name} declared a war on its rival ${defender.name}`];
+
+    // vassals join the war
+    function addVassals(state: IState, side: "attackers" | "defenders") {
+      const vassals = getVassals(state);
+      if (vassals.length === 0) return [];
+      const names = list(vassals.map(({name}) => name));
+      history.push(`${state.name}'s vassal${vassals.length > 1 ? "s" : ""} ${names} joined the war on ${side} side`);
+      return vassals;
+    }
+
+    const attackers = [attacker, ...addVassals(attacker, "attackers")];
+    const defenders = [defender, ...addVassals(defender, "defenders")];
+
+    let attackersPower = d3.sum(attackers.map(getStatePower));
+    let defendersPower = d3.sum(defenders.map(getStatePower));
+
+    defender.relations.forEach((relation, stateId) => {
+      if (relation !== "Ally" || !stateId) return;
+      const ally = statesMap.get(stateId)!;
+      if (ally.relations.includes("Vassal")) return;
+
+      const allyParty = [ally, ...getVassals(ally)];
+
+      const joinedPower = defendersPower + d3.sum(allyParty.map(getStatePower));
+      const isWeak = joinedPower < attackersPower * gauss(1.6, 0.8, 0, 10, 2);
+      const isRival = ally.relations[attacker.i] !== "Rival";
+      if (!isRival && isWeak) {
+        // defender's ally does't involve: break the pact
+        const reason = ally.relations.includes("Enemy") ? "Being already at war," : `Frightened by ${attacker.name},`;
+        history.push(`${reason} ${ally.name} severed the defense pact with ${defender.name}`);
+
+        allyParty.forEach(ally => {
+          defender.relations[ally.i] = "Suspicion";
+          ally.relations[defender.i] = "Suspicion";
+        });
+
+        return;
+      }
+
+      // defender's ally and its vassals join the war
+      defenders.push(...allyParty);
+      const withVassals = allyParty.length > 1 ? " and its vassals " : "";
+      history.push(`Defender's ally ${ally.name}${withVassals}joined the war`);
+
+      defendersPower = joinedPower;
+    });
+
+    attacker.relations.forEach((relation, stateId) => {
+      if (relation !== "Ally" || !stateId) return;
+      if (defenders.some(defender => defender.i === stateId)) return;
+      const ally = statesMap.get(stateId)!;
+      if (ally.relations.includes("Vassal")) return;
+
+      const allyParty = [ally, ...getVassals(ally)];
+
+      const joinedPower = attackersPower + d3.sum(allyParty.map(getStatePower));
+      const isWeak = joinedPower < defendersPower * 1.2;
+      const isRival = ally.relations[defender.i] !== "Rival";
+      if (!isRival || isWeak) {
+        history.push(`Attacker's ally ${ally.name} avoided entering the war`);
+        return;
+      }
+
+      const allies = ally.relations.map((relation, stateId) => (relation === "Ally" ? stateId : 0));
+      if (defenders.some(({i}) => allies.includes(i))) {
+        history.push(`Attacker's ally ${ally.name} did not join the war as it has allies on both sides`);
+        return;
+      }
+
+      // attacker's ally and its vassals join the war
+      attackers.push(...allyParty);
+      const withVassals = allyParty.length > 1 ? " and its vassals " : "";
+      history.push(`Attacker's ally ${ally.name}${withVassals}joined the war`);
+
+      attackersPower = joinedPower;
+    });
+
+    // change relations to Enemy for all participants
+    attackers.forEach(attacker => {
+      defenders.forEach(defender => {
+        defender.relations[attacker.i] = "Enemy";
+        attacker.relations[defender.i] = "Enemy";
+      });
+    });
+
+    const advantage = getAdvantage(attackersPower, defendersPower);
+    const winning = attackersPower > defendersPower ? "attackers" : "defenders";
+    history.push(`At the moment, the ${advantage} advantage is on the side of the ${winning}`);
+
+    const name = `${attacker.name}-${trimVowels(defender.name)}ian War`;
+    const parties = {attackers: attackers.map(({i}) => i), defenders: defenders.map(({i}) => i)};
+    const start = options.year - gauss(2, 2, 0, 5);
+    return {type: "conflict", name, start, parties, description: history.join(". ")};
+  }
+
+  function getStatePower(state: IState) {
+    return state.area * state.expansionism;
+  }
+
+  function getVassals(state: IState) {
+    return state.relations
+      .map((relation, stateId) => (relation === "Suzerain" ? stateId : 0))
+      .filter(stateId => stateId)
+      .map(stateId => statesMap.get(stateId)!);
+  }
+
+  function getAdvantage(p1: number, p2: number) {
+    const advantage = p1 > p2 ? p1 / p2 : p2 / p1;
+    if (advantage > 3) return "overwhelming";
+    if (advantage > 2) return "decisive";
+    if (advantage > 1.3) return "significant";
+    return "minor";
+  }
+}
diff --git a/src/scripts/generation/pack/burgsAndStates/simulateWars.ts b/src/scripts/generation/pack/burgsAndStates/simulateWars.ts
deleted file mode 100644
index abe3c2b7..00000000
--- a/src/scripts/generation/pack/burgsAndStates/simulateWars.ts
+++ /dev/null
@@ -1,35 +0,0 @@
-import {TIME} from "config/logging";
-
-import type {TStateData} from "./createStateData";
-import type {TDiplomacy} from "./generateRelations";
-
-export function simulateWars(statesData: TStateData[], diplomacy: TDiplomacy) {
-  TIME && console.time("simulateWars");
-
-  // declare wars
-  for (const {i} of statesData) {
-    const relations = diplomacy[i];
-    if (!relations.includes("Rival")) continue; // no rivals to attack
-    if (relations.includes("Vassal")) continue; // not independent
-    if (relations.includes("Enemy")) continue; // already at war
-
-    // select candidates to attack: rival independent states
-    const candidates = relations
-      .map((relation, index) => (relation === "Rival" && !diplomacy[index].includes("Vassal") ? index : 0))
-      .filter(index => index);
-    if (!candidates.length) continue;
-
-    const attacker = getDiplomacyData(statesData[i], statistics);
-    const defender = getDiplomacyData(statesData[ra(candidates)], statistics);
-
-    const attackerPower = attacker.area * attacker.expansionism;
-    const defenderPower = defender.area * defender.expansionism;
-    if (attackerPower < defenderPower * gauss(1.6, 0.8, 0, 10, 2)) continue; // defender is too strong
-
-    const attackers = [attacker];
-    const defenders = [defender];
-  }
-
-  TIME && console.timeEnd("simulateWars");
-  return null;
-}
diff --git a/src/scripts/generation/pack/burgsAndStates/specifyStates.ts b/src/scripts/generation/pack/burgsAndStates/specifyStates.ts
index bdc718a3..cebb55db 100644
--- a/src/scripts/generation/pack/burgsAndStates/specifyStates.ts
+++ b/src/scripts/generation/pack/burgsAndStates/specifyStates.ts
@@ -4,6 +4,7 @@ import {createAreaTiers, defineStateForm} from "./defineStateForm";
 import {defineFullStateName, defineStateName} from "./defineStateName";
 import {defineStateColors} from "./defineStateColors";
 import {isBurg} from "utils/typeUtils";
+import {generateConflicts} from "./generateConflicts";
 
 import type {TStateStatistics} from "./collectStatistics";
 import type {TStateData} from "./createStateData";
@@ -32,13 +33,15 @@ export function specifyStates(
     if (!capitalName) throw new Error("State capital is not a burg");
 
     const relations = diplomacy[i];
+    const isVassal = relations.includes("Vassal");
+
     const nameBase = getNameBase(culture);
     const areaTier = getAreaTier(area);
-    const {form, formName} = defineStateForm(type, areaTier, nameBase, burgsNumber, relations, neighbors);
+    const {form, formName} = defineStateForm(type, areaTier, nameBase, burgsNumber, neighbors, isVassal);
     const name = defineStateName(center, capitalName, nameBase, formName);
     const fullName = defineFullStateName(name, formName);
 
-    const state: IState = {
+    return {
       name,
       ...stateData,
       form,
@@ -51,9 +54,12 @@ export function specifyStates(
       neighbors,
       relations
     };
-    return state;
   });
 
+  const wars = generateConflicts(states); // mutates states
+  console.log(wars);
+  console.log(states);
+
   TIME && console.timeEnd("specifyStates");
   return [NEUTRALS, ...states];
 }
diff --git a/src/scripts/generation/pack/pack.ts b/src/scripts/generation/pack/pack.ts
index 8ff96f6b..85af9c85 100644
--- a/src/scripts/generation/pack/pack.ts
+++ b/src/scripts/generation/pack/pack.ts
@@ -149,7 +149,6 @@ export function createPack(grid: IGrid): IPack {
     }
   });
 
-  // BurgsAndStates.defineStateForms();
   // BurgsAndStates.generateProvinces();
   // BurgsAndStates.defineBurgFeatures();
 
diff --git a/src/types/events.d.ts b/src/types/events.d.ts
new file mode 100644
index 00000000..25ef3a08
--- /dev/null
+++ b/src/types/events.d.ts
@@ -0,0 +1,15 @@
+interface IEvent {
+  type: string;
+  name: string;
+  start: number;
+  end?: number; // undefined for ongoing events
+  description: string;
+}
+
+interface IConflict extends IEvent {
+  type: "conflict";
+  parties: {
+    attackers: number[];
+    defenders: number[];
+  };
+}
diff --git a/src/types/globals.d.ts b/src/types/globals.d.ts
index 005d054a..c1c18074 100644
--- a/src/types/globals.d.ts
+++ b/src/types/globals.d.ts
@@ -24,6 +24,7 @@ interface IOptions {
   showMFCGMap: boolean;
   winds: [number, number, number, number, number, number];
   stateLabelsMode: "auto" | "short" | "full";
+  year: number;
 }
 
 declare let populationRate: number;