diff --git a/src/simulator/api-gdext/src/lib.rs b/src/simulator/api-gdext/src/lib.rs
index 553f38d6..02b3f967 100644
--- a/src/simulator/api-gdext/src/lib.rs
+++ b/src/simulator/api-gdext/src/lib.rs
@@ -2980,19 +2980,24 @@ impl GdGameState {
 
         let city_col = city_col as i32;
         let city_row = city_row as i32;
-        let units = (0..3)
-            .map(|i| mc_turn::MapUnit {
-                col: city_col + i,
-                row: city_row,
-                hp: 60,
-                max_hp: 60,
-                attack: 12,
-                defense: 1,
-                is_fortified: false,
-                unit_id: "dwarf_warrior".to_string(),
-                held_resources: Vec::new(),
-                patrol_order: None,
-                ..Default::default()
+        let units: Vec<mc_turn::MapUnit> = (0..3)
+            .map(|i| {
+                let unit_u32 = self.inner.next_unit_id;
+                self.inner.next_unit_id = self.inner.next_unit_id.saturating_add(1);
+                mc_turn::MapUnit {
+                    id: unit_u32,
+                    col: city_col + i,
+                    row: city_row,
+                    hp: 60,
+                    max_hp: 60,
+                    attack: 12,
+                    defense: 1,
+                    is_fortified: false,
+                    unit_id: "dwarf_warrior".to_string(),
+                    held_resources: Vec::new(),
+                    patrol_order: None,
+                    ..Default::default()
+                }
             })
             .collect();