After World War II, he returned to the colonies and was aprisoner of war of theVietminh, during two months in 1945, after the outbreak of theFirst Indochina War.[1] He was named the following year general secretary of the interministerial committee forIndochina and then head of staff of the high commissary of the Republic.[1]
Messmer began his high-level African service as governor ofMauritania from 1952 to 1954, and then served as governor ofIvory Coast from 1954 to 1956, when he briefly returned to Paris in the staff ofGaston Defferre, Minister of Overseas Territories who enacted the Defferre Act granting to colonial territories internal autonomy, a first step towards independence.
That same year, Messmer was nominated as governor general ofCameroun, where a civil war had started the preceding year following the outlawing of the independentistUnion of the Peoples of Cameroon (UPC) in July 1955. He initiated adecolonization process and imported thecounter-revolutionary warfare methods theorized in Indochina and implemented during theAlgerian War (1954–62).[4] Visiting de Gaulle in Paris, he was implicitly granted permission for his change of policies in Cameroon, which exchanged repression for negotiations with the UPC.[4]
A "Pacification Zone" – the ZOPAC (Zone de pacification du Cameroon) was created on 9 December 1957, englobing 7,000 square km controlled by seven infantry regiments.[4] Furthermore, a civilian-military intelligence apparatus was created, combining colonial and local staff, assisted by a civilian militia.Mao Zedong'speople's war was reversed in an attempt to separate the civilian population from the guerrilla. In that aim, the local population was rounded up in guarded villages located on the main roads that were controlled by the French Army.[4]
In 1960, Messmer visited Lisbon and expressed lament for the United Nations resolutions against colonialism and approved of theEstado Novo regime's hardline stance against decolonisation on the grounds that Portugal represented the last vestige of white Western civilisation on the African continent.[5]
Messmer gave permission for formerAlgerian War veterans to fight inKatanga against the newly independentCongo andUnited Nations peacekeeping forces. He confided toRoger Trinquier that it was de Gaulle's ambition to replace the Belgians and control a reunited Congo fromÉlisabethville.[6]
Along with the Minister of Research,Gaston Palewski, Messmer was present at theBéryl nuclear test in Algeria, on 1 May 1962 during which an accident occurred. Officials, soldiers, and Algerian workers escaped as they could, often without wearing any protection. Palewski died in 1984 ofleukemia, which he always has attributed to theBeryl incident, and Messmer always remained close-mouthed on the affair.[7][8]
Messmer became a personality of theGaullist Party and waselected deputy in 1968, representingMoselledépartement. A member of the conservative wing of the Gaullist movement, he criticised the "New Society" plan of Prime MinisterJacques Chaban-Delmas and thus won the trust ofGeorges Pompidou,elected President in 1969.[3] He quit the government after de Gaulle's resignation and founded the associationPrésence du gaullisme (Presence of Gaullism).[1]
He occupied cabinet positions again in the 1970s, serving first asMinister of state charged ofthe Overseas Territories in 1971,[9] then as Prime Minister from July 1972 to May 1974.
He succeeded in this function toJacques Chaban-Delmas, who had adopted aparliamentary reading of theConstitution, which Messmer opposed in his investiture speech.[9] Messmer had been chosen by Pompidou as a guarant of his fidelity to de Gaulle, and his cabinet included personalities close to Pompidou, such asJacques Chirac, named Minister of Agriculture.[10]
Due to PresidentGeorges Pompidou's illness, he dealt with the everyday administration of the country and adopted a conservative stance opposed to Chaban-Delmas' previous policies. Henceforth, he stopped the liberalization of theORTF media governmental organization, naming as its CEOArthur Conte, a personal friend of Pompidou.[10]
In 1974, when Pompidou died, those close to Messmer encouraged him to run for president. He accepted at the condition of Chaban-Delmas,Valéry Giscard d'Estaing andEdgar Faure's withdrawals. Faure accepted, as well as Giscard on the condition that Chaban-Delmas also withdrew himself. However, Chaban-Delmas, despite theCanard enchaîné's campaign against him, maintained himself, leading Messmer to withdraw his candidacy. Finally,Valéry Giscard d'Estaing, a conservative rival of the Gaullists, waselected. He served as prime minister for another few weeks after Pompidou's death, ending his term after the presidential elections.Jacques Chirac replaced him on 29 May 1974.[12] After the election of Giscard, he never held again ministerial offices, and became one of the historical voices of Gaullism.[3]
Messmer remained a Member of Parliament for the Moselle department until 1988, and served as President of theLorraine regional assembly from 1968 to 1992. He was mayor of the town ofSarrebourg from 1971 to 1989. Messmer was also president of theRally for the Republic (RPR) parliamentary group during the firstcohabitation (1986–1988), underJacques Chirac's government.[1] In 1997 he testified as a witness during the trial ofMaurice Papon, charged ofcrimes against humanity committed under theVichy regime, and declared: "The time has come when the Frenchmen could stop hating themselves and begin to grant pardon to themselves".[13] Along with some other former Resistants, he demanded Papon'spardon in 2001.[1]
He died in 2007 aged 91, just four days after fellow Prime MinisterRaymond Barre. He was the last surviving major French Politician to have been a member of the Free French forces.
An important figure of the French Resistance during World War II, Pierre Messmer was a member of theOrdre de la Libération, and the recipient of numerous decorations including the highest rank of theLégion d'honneur. In 2006, he was named Chancellier de l'Ordre de la Libération after the death of GeneralAlain de Boissieu.[2] He was also an officer of theAmerican Legion.[2]