https://forums.civfanatics.com/threads/civ-ii-combat-statistics.673787/#post-16172841

[civ2units]

I've tested it with my Reformation scenario and also noticed, that the Dhow unit with submarine flag defends with 1 firepower instead of 4. Could it be a bug from the game itself?

 

[civ2units]

When I disable the flag, the unit has it's actual 4 firepower