History of Madeira the ships, the Germans proceeded to bombard Funchal for two hours from a range of about . Batteries on Madeira returned fire and eventually forced the Germans to withdraw. In 1917 on December 12, two German U-boats, and (captained by Max Valentiner) again bombarded Funchal, Madeira. This time the attack lasted around 30 minutes. Forty, 4.7 inch and 5.9 inch shells were fired. There were 3 fatalities and 17 wounded, In addition, a number of houses and Santa Clara church were hit. A priest, José Marques Jardim, promised in 1917 to build a monument should peace ever return to Madeira.
Madeira over 6,000 "arrobas" (an "arroba" was equal to 11 to 12 kilograms) by 1455, using advisers from Sicily and financed by Genoese capital. (Genoa acted as an integral part of the island economy until the 17th century.) The accessibility of Madeira attracted Genoese and Flemish traders, who were keen to bypass Venetian monopolies. Sugarcane production was the primary engine of the island's economy, increasing the demand for labour. African slaves were used during portions of the island's history to cultivate sugar cane, and the proportion of imported slaves reached 10% of the total population of Madeira by the 16th century.