The Schwerer Gustav, a World War II German railway gun, fired seven-ton shells with an effective range of 29 miles.

High Explosives is a Level 9 Technology which increases the Trench Mortar hitpoints and is unlocked in the Global Age , attack and range

 General Information Edit

Chapter Requirements Cost Food Time XP Gain Description
1 Library Level 9

+ Command

or Warfare

1,500,000 8h 1,010 +10% Mortar troop hitpoints
2 3,000,000 3d 3,370 +10% Mortar troop attack
3 4,500,000 6d 4,935 +10% Mortar troop hitpoints
4 6,000,000 8d 5,780 +10% Mortar troop attack
5 9,000,000 12d 7,225 +1 Mortar troop range

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