Cossack was first introduced in 0.7.0.
0.7.4
Now Cossack has four 120mm turrets. The 102mm secondary gun and a 40 mm QF AA gun is removed.
Her Hydroacoustic Search works differently with unique parameters: Ship detection - 3.21 km; torpedo detection - 2.79 km; activation time - 180 seconds; reload time - 180/120 seconds.
0.7.6
Cossack moved from Tier VII to Tier VIII.
She now uses Edinburgh's smoke generator.

| Hit Points | 15200 |
| Plating | 19mm |
| Maximum Speed | 36 knots |
| Turning Radius | 610m |
| Rudder shift time | 3.58 sec |
| Surface Detectability | 6.84 km |
| Aerial Detectability | 3.9 km |
| Consumable 1 | ![]() ![]() |
| Consumable 2 | ![]() (Edinburgh ver.) |
| Consumable 3 | ![]() ![]() |
| Consumable 4 | ![]() ![]() |
| 120mm/45 CPXIX | |
| Layout | 4×2, AB-XY |
| Reload Time | 5 sec |
| 180° rotating time | 18 sec |
| Sector of Fire | A ±115°, B ±156°, X ±153°, Y ±119° |
| Firing Range | 11.89 km |
| σ | 2.0 |
| 120mm HE | |
| Damage | 1900 |
| Muzzle Velocity | 808 m/s |
| Chance of Fire | 5% |
| 120mm AP | |
| Damage | 2100 |
| Muzzle Velocity | 808 m/s |
| 533mm QR Mark II | |
| Layout | 1×4 |
| Torpedo firing sector | 49° – 106° |
| 533mm Mark IX | |
| Reload Time | 96 sec |
| Torpedo Damage | 15867 |
| Torpedo Speed | 62 knots |
| Torpedo Range | 8 km |
| Detectability | 1.4 km |
| 40mm 2-pdr. Mark VII | ||
| Layout | Average DPS | Firing Range |
| 1×4 | 13 | 2.5 km |
| 12.7mm Mark III | ||
| Layout | Average DPS | Firing Range |
| 2×4 | 4 | 1.2 km |

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(Edinburgh ver.)


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