diff --git a/src/simulator/crates/mc-combat/src/siege.rs b/src/simulator/crates/mc-combat/src/siege.rs
index a545237a..de54f09d 100644
--- a/src/simulator/crates/mc-combat/src/siege.rs
+++ b/src/simulator/crates/mc-combat/src/siege.rs
@@ -12,7 +12,7 @@ pub const BASE_CITY_HP: i32 = 200;
 pub const WALL_HP_PER_TIER: i32 = 50;
 
 /// Siege unit bonus vs city HP (applied as positive modifier to siege damage).
-const SIEGE_CITY_BONUS: f32 = 2.00;
+const SIEGE_CITY_BONUS: f32 = 1.70;
 
 /// City heals this much HP per turn.
 pub const CITY_HEAL_PER_TURN: i32 = 10;
@@ -23,12 +23,12 @@ const RANGED_CITY_HP_FRACTION: f32 = 0.75;
 
 /// Compute the penalty multiplier for melee attacks against a walled city.
 /// Returns a value < 1.0 that the attacker's effective strength is multiplied by.
-/// Scales by tier: 0=1.0, 1=0.85 (walls), 2=0.75 (castle).
+/// Scales by tier: 0=1.0, 1=0.80 (walls), 2=0.65 (castle).
 pub fn melee_wall_penalty(wall_tier: i32) -> f32 {
     match wall_tier {
         0 => 1.0,
-        1 => 0.85,
-        _ => 0.75,
+        1 => 0.80,
+        _ => 0.65,
     }
 }
 
@@ -90,9 +90,9 @@ mod tests {
     #[test]
     fn melee_penalty_scales_by_tier() {
         assert!((melee_wall_penalty(0) - 1.0).abs() < 0.001);
-        assert!((melee_wall_penalty(1) - 0.85).abs() < 0.001);
-        assert!((melee_wall_penalty(2) - 0.75).abs() < 0.001);
-        assert!((melee_wall_penalty(3) - 0.75).abs() < 0.001);
+        assert!((melee_wall_penalty(1) - 0.80).abs() < 0.001);
+        assert!((melee_wall_penalty(2) - 0.65).abs() < 0.001);
+        assert!((melee_wall_penalty(3) - 0.65).abs() < 0.001);
     }
 
     #[test]
@@ -111,7 +111,7 @@ mod tests {
 
     #[test]
     fn siege_bonus() {
-        assert!((siege_city_bonus() - 2.00).abs() < 0.001);
+        assert!((siege_city_bonus() - 1.70).abs() < 0.001);
     }
 
     #[test]