 All six ships were armed with a main battery of four 15 cm ( 5 @.@ 9 in ) L / 40 guns mounted singly , with two side by side forward and two side by side aft . Six 12 cm ( 4 @.@ 7 in ) L / 40 guns were placed between them , with three on each broadside . The ships ' light armament varied . All of the ships save Lombardia were equipped with eight 57 mm ( 2 @.@ 2 in ) guns , which had an additional two of these guns . Umbria was also equipped with one 75 mm ( 3 @.@ 0 in ) gun and nine 37 mm ( 1 @.@ 5 in ) guns , while Puglia had eight of the 37 mm guns and Elba had six of them . Liguria and Etruria only had two 37 mm guns , and Lombardia had none . All six ships had a pair of machine guns and two 45 cm ( 18 in ) torpedo tubes . 
