Pelloux was born in La Roche-sur-Foron, Savoy, then part of the Kingdom of Sardinia. Entering the army as lieutenant of artillery in 1857 he gained the medal for military valour at the Battle of Custoza in 1866, and on September 20, 1870, commanded the brigade of artillery which battered the breach in the wall of Rome at Porta Pia, which enabled Bersaglieri soldiers to enter Rome and complete the unification of Italy. He entered the war office in 1870, and in 1880 became General Secretary, in which capacity he introduced many useful reforms in the army. He was elected to the Chamber in 1881 as deputy for Livorno, which he represented until 1895, and joined the party of the Left. After a succession of high military commands he received the appointment of Chief of the General Staff in 1896. He was Minister of War in the Rudinì and Giolitti cabinets of 1891–1893. In July 1896 he resumed the portfolio of War in the Rudinì cabinet, and was appointed Senator. In May 1897 he secured the adoption of the Army Reform Bill, fixing Italian military expenditure at a maximum of 9,560,000 a year, but in December of that year he was defeated in the Chamber on the question of the promotion of officers.
Resigning office, he was sent as Royal Commissioner to Bari in May 1898, where, without recourse to martial law, he succeeded in restoring public order suppressing street demonstrations demanding "bread and work". Upon the fall of Rudinì in June 1898, after the Bava-Beccaris massacre, General Pelloux was entrusted by King Umberto with the formation of a new government, and took for himself the post Prime Minister and Minister of the Interior. He resigned office in May 1899 over his Chinese policy, but was again entrusted with the formation of a government. His new cabinet was essentially military and conservative, the most decisively conservative since 1876. He took stern measures against the revolutionary elements in Italy. The Public Safety Bill for the reform of the police laws, taken over by him from the Rudinì cabinet, and eventually promulgated by royal decree, was fiercely obstructed by the Socialist Party of Italy and Extreme Left. The law made strikes by state employees illegal; gave the executive wide powers to ban public meetings and dissolve subversive organisations; revived the penalties of banishment and preventive arrest for political offences; and tightened control of the press by making authors responsible for their articles and declaring incitement to violence a crime. The Radicals and Socialist start an obstructionist campaign against the new coercive law using the filibuster: points of order, endless speeches and other procedural delaying tactics. When Pelloux tried to force the law through Parliament by royal decree in June 1899, more moderate politicians like Giuseppe Zanardelli and Giovanni Giolitti that considered the measure unconstitutional, joined the opposition. The growing opposition succeeded in forcing General Pelloux to dissolve the Chamber in May 1900, and to resign office after the general election in June.
Later career
In the autumn of 1901 he was appointed to the command of the Turinarmy corps. He retired in 1905. Pelloux died at Bordighera in 1924.
