diff --git a/src/App.js b/src/App.js
index ba3b706..9a8e0bb 100644
--- a/src/App.js
+++ b/src/App.js
@@ -1732,21 +1732,36 @@ function InitiativeControls({ campaignId, encounter, encounterPath }) {
     }
 
     let nextIndex = (currentIndex + 1) % activePsInOrder.length;
+    let newTurnOrderIds = encounter.turnOrderIds;
 
     if (nextIndex === 0 && currentIndex !== -1) {
       nextRound += 1;
+      // Rebuild turn order by initiative at the start of each new round so that participants
+      // activated mid-round (appended to the end) slot into proper initiative position next round.
+      const activePs = encounter.participants.filter(p => p.isActive);
+      const sorted = sortParticipantsByInitiative(activePs, encounter.participants);
+      newTurnOrderIds = sorted.map(p => p.id);
     }
 
+    // When wrapping to a new round the next participant is first in the rebuilt order
+    const nextParticipant = (nextIndex === 0 && currentIndex !== -1)
+      ? encounter.participants.find(p => p.id === newTurnOrderIds[0])
+      : activePsInOrder[nextIndex];
+
+    if (!nextParticipant) return;
+
     try {
       await updateDoc(doc(db, encounterPath), {
-        currentTurnParticipantId: activePsInOrder[nextIndex].id,
-        round: nextRound
+        currentTurnParticipantId: nextParticipant.id,
+        round: nextRound,
+        turnOrderIds: newTurnOrderIds,
       });
-      logAction(`${activePsInOrder[nextIndex].name}'s turn (Round ${nextRound})`, { encounterName: encounter.name }, {
+      logAction(`${nextParticipant.name}'s turn (Round ${nextRound})`, { encounterName: encounter.name }, {
         encounterPath,
         updates: {
           currentTurnParticipantId: encounter.currentTurnParticipantId,
           round: encounter.round,
+          turnOrderIds: [...encounter.turnOrderIds],
         },
       });
     } catch (err) {