 Charles Martel 's main armament consisted of two Canon de 305 mm Modèle 1887 guns in two single @-@ gun turrets , one each fore and aft . She also mounted two Canon de 274 mm Modèle 1887 guns in two single @-@ gun turrets , one amidships on each side , sponsoned out over the tumblehome of the ship 's sides . Her secondary armament consisted of eight Canon de 138 @.@ 6 mm Modèle 1888 guns , which were mounted in single turrets at the corners of the superstructure . She also carried four 9 @-@ pounder quick @-@ firing guns , twelve 3 @-@ pounders , and eight 1 @-@ pounder revolving cannons . Her armament suite was rounded out by two 450 mm ( 18 in ) torpedo tubes , which were submerged in the ship 's hull . 
