Militarily, Carlos Antonio López modernized and expanded industry and the Paraguayan Army and greatly strengthened the strategic defenses of Paraguay by developing the Fortress of Humaitá. The government hired more than 200 foreign technicians, who installed telegraph lines and railroads to aid the expanding steel, textile, paper and ink, naval construction, weapons and gunpowder industries. The Ybycuí foundry, completed in 1850, manufactured cannons, mortars and bullets of all calibers. River warships were built in the shipyards of Asunción. Fortifications were built, especially along the Apa River and in Gran Chaco. The work was continued by his son Francisco Solano and in terms of socio-economic development, the country was dubbed as "the most advanced Republic in South America", notably by the British judge and politician Sir Robert Phillimore.