diff --git a/cli/app.py b/cli/app.py
new file mode 100644
index 0000000..2064696
--- /dev/null
+++ b/cli/app.py
@@ -0,0 +1,38 @@
+from cli.war_menu import war_menu
+from cli.utils import choose_from_list
+
+def app_menu(data):
+    while True:
+        print("\n=== Warmachron ===")
+        print("1. Select war")
+        print("2. Create war")
+        print("3. Manage players")
+        print("0. Exit")
+
+        choice = input("> ").strip()
+
+        if choice == "1":
+            war = select_war(data)
+            if war:
+                war_menu(data, war)
+
+        elif choice == "2":
+            create_war(data)
+
+        elif choice == "3":
+            manage_players(data)
+
+        elif choice == "0":
+            return
+
+def select_war(data):
+    wars = data["wars"]
+    if not wars:
+        print("No wars available.")
+        return None
+
+    return choose_from_list(
+        wars,
+        lambda w: f"{w['name']} ({w['year']})"
+    )
+
diff --git a/cli/campaign_menu.py b/cli/campaign_menu.py
new file mode 100644
index 0000000..c29239e
--- /dev/null
+++ b/cli/campaign_menu.py
@@ -0,0 +1,23 @@
+from cli.round_menu import round_menu
+
+def campaign_menu(data, war, campaign):
+    while True:
+        print(f"\n=== Campaign: {campaign['name']} ===")
+        print("1. Select round")
+        print("2. Append round")
+        print("3. Finish campaign")
+        print("4. Edit/Delete campaign")
+        print("0. Back")
+
+        choice = input("> ").strip()
+
+        if choice == "1":
+            rnd = select_round(campaign)
+            if rnd:
+                round_menu(data, war, campaign, rnd)
+
+        elif choice == "2":
+            append_round(campaign)
+
+        elif choice == "0":
+            return
diff --git a/cli/menu.py b/cli/menu.py
deleted file mode 100644
index 91f46ce..0000000
--- a/cli/menu.py
+++ /dev/null
@@ -1,9 +0,0 @@
-def main_menu():
-    print("\n=== Wargame Campaign App ===")
-    print("1. List wars")
-    print("2. Start new campaign")
-    print("3. Start new round")
-    print("4. Enter battle results")
-    print("5. Save & exit")
-
-    return input("> ")
diff --git a/cli/round_menu.py b/cli/round_menu.py
new file mode 100644
index 0000000..6c98c17
--- /dev/null
+++ b/cli/round_menu.py
@@ -0,0 +1,34 @@
+def round_menu(data, war, campaign, rnd):
+    while True:
+        print(f"\n=== Round {rnd['number']} ===")
+        print("1. Enter choices and pairing")
+        print("2. Enter battle results")
+        print("3. Finish round")
+        print("4. Edit/Delete round")
+        print("0. Back")
+
+        choice = input("> ").strip()
+
+        if choice == "1":
+            enter_choices(data, war, campaign, rnd)
+
+        elif choice == "2":
+            enter_battle_results(data, war, campaign, rnd)
+
+        elif choice == "0":
+            return
+
+def enter_choices(data, war, campaign, rnd):
+    print("Entering choices (placeholder)")
+    # later:
+    # - list campaign participants
+    # - input primary / secondary sector
+    # - store in rnd["choices"]
+
+def enter_battle_results(data, war, campaign, rnd):
+    print("Entering battle results (placeholder)")
+    # later:
+    # - list battles
+    # - select winner
+    # - apply scoring
+
diff --git a/cli/utils.py b/cli/utils.py
new file mode 100644
index 0000000..32045e7
--- /dev/null
+++ b/cli/utils.py
@@ -0,0 +1,14 @@
+def choose_from_list(items, label_fn):
+    for i, item in enumerate(items, start=1):
+        print(f"{i}. {label_fn(item)}")
+    print("0. Back")
+
+    choice = input("> ").strip()
+    if choice == "0":
+        return None
+
+    try:
+        return items[int(choice) - 1]
+    except (ValueError, IndexError):
+        print("Invalid choice")
+        return None
diff --git a/cli/war_menu.py b/cli/war_menu.py
new file mode 100644
index 0000000..8400888
--- /dev/null
+++ b/cli/war_menu.py
@@ -0,0 +1,33 @@
+from cli.campaign_menu import campaign_menu
+from storage.repository import save_data
+
+def war_menu(data, war):
+    while True:
+        print(f"\n=== War: {war['name']} ===")
+        print("1. Select campaign")
+        print("2. Append campaign")
+        print("3. Finish war")
+        print("4. Edit/Delete war")
+        print("0. Back")
+
+        choice = input("> ").strip()
+
+        if choice == "1":
+            campaign = select_campaign(war)
+            if campaign:
+                campaign_menu(data, war, campaign)
+
+        elif choice == "2":
+            append_campaign(war)
+
+        elif choice == "0":
+            return
+
+def append_campaign(war, data):
+    name = input("Campaign name: ")
+    war["campaigns"].append({
+        "name": name,
+        "rounds": [],
+        "completed": False
+    })
+    save_data(data)
diff --git a/main.py b/main.py
index b0f23a0..45047d5 100644
--- a/main.py
+++ b/main.py
@@ -1,21 +1,10 @@
 from storage.repository import load_data, save_data
-from cli.menu import main_menu
+from cli.app import app_menu
 
 def main():
     data = load_data()
-
-    while True:
-        choice = main_menu()
-
-        if choice == "1":
-            print("Wars:")
-            for war in data["wars"]:
-                print(f"- {war['name']}")
-
-        elif choice == "5":
-            save_data(data)
-            print("Goodbye.")
-            break
+    app_menu(data)
+    save_data(data)
 
 if __name__ == "__main__":
     main()