Valentin Lievre Operation Citadel 5.7.18 Hex of Steel 5.7.18 Operation Citadel 2.2.4 Operation Citadel 2.1.2 Operation Citadel 2.0.8 Operation Citadel 2.0.7 Operation Citadel 2.0.3 Operation Citadel 1.9.12.3 Operation Citadel 1.9.13 Operation Citadel 1.6.10 Operation Citadel 1.7.1