So here is some quick math for Pawn destruction, mainly
King George V,
Myoukou,
Nagara,
Mutsuki ships:
Frag of steel is 208 j/cc
structural steel density: 7850 kg/m3
1. Battleship
mass: 33,852,505.75784 kg (King George V)
volume: 4312.42101911 m3 = 4312421019.11 cm3
4312421019.11*208= 896983571975 joules = 214.38421892 tons (Multi-City Block level)
2. Heavy Cruiser
mass: 12,246,993.99 kg (Myoukou)
volume: 1560.12649682 m3 = 1560126496,82 cm3
1560126496,82*208= 324506311339 joules = 77.558869823 tons (City Block level)
3. Light Cruiser
mass: 5,133,758.44366 kg (Nagara)
volume: 653.981910828 m3 = 653981910,828 cm3
653981910,828*208= 136028237452 joules = 32.511529028 tons (City Block level)
4. Destroyer
mass: 1,211,998.81264 kg (Mutsuki)
volume: 154.394649682 m3 = 154394649,682 cm3
154394649,682*208= 32114087133.9 joules = 7.6754510358 tons (Large Building level)