It was then used in the photoplannimetric role and as a supplier of isolated troops, this time in the Balkans, after the 'conquest' of Yugoslavia. Peru took delivery of a number of Ca.111s in the 1930s which they nicknamed "Panchos" for use as "heavy" bombers, but found them unsatisfactory in service and by 1935 had begun to consider replacing them. In 1936, Peru ordered Caproni Ca.135 bombers—which entered Peruvian Air Force service in 1937—as replacements for its Ca.111s. However, Peru never procured enough Ca.135s to replace its Ca.111s; Ca.111s served in Peruvian Air Force heavy bomber squadrons alongside the new Ca.135s until 1940, when all Peruvian Ca.111s were reassigned for use as transport aircraft. Peru which had a small unit of paratroopers trained by Italy, during the Zarumilla War of 1941 dropped a small number of paratroopers from Ca. 111 R.C. aircraft on 27 July to seize the river port of Port Bolivar in disputed territory. This was the first combat use of paratroopers in South American or North America's military history.