River gunboat
A river gunboat is a type of gunboat adapted for river operations. River gunboats required shallow draft for river navigation.
A river gunboat is a type of gunboat adapted for river operations. River gunboats required shallow draft for river navigation.
A river gunboat is a type of gunboat adapted for river operations. River gunboats required shallow draft for river navigation.
Source: Wikipedia "River gunboat" · CC BY-SA 4.0
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