Second World War
He is Carville's aide, advising an unnamed commander during the Soviet invasion of Europe. Gunther Von Esling, the Supreme Allied Commander, is helped by Monnage to push Soviet forces under Stalin and Gradenko out of Germany and Greece. After the Allied victory, Monnage comes to aid Carville later on.
Third World War
Monnage is briefly seen during the briefing of Operation: Deep Sea where Carville, glad to have his office back, tells the famed commander to directly go to Pearl Harbor to defeat Vladimir's naval forces. After Carville was assassinated, Monnage was affected by the suicide bombing and was present at Carville's funeral.
Behind the Scenes
General Monnage was played by Robert Eustice in Red Alert: Retaliation and Yuri's Revenge.