The United States Invasion of Panama, codenamed Operation Just Cause, lasted over a month between mid-December and late January The military incursion into Panama began on Decem, at a.m. local time. The invasion of Panama was the first combat deployment for the AH Tensions between Americans in the Panama Canal Zone and Noriega's Panamanian Defense Forces grew, and in the dictator annulled a presidential election that. It was 20 December , and the once close relationship between General Manuel Noriega and the US had deteriorated to the point of no. The invasion took place on 20 December after ties between the US government and Panamanian leader General Manuel Noriega sank to an all. Panama - Panama - Invasion of Panama: In the presidential election of May , Guillermo Endara Galimany and his two vice presidents won by a wide margin. been exhumed from a mass grave in Panama amid searches for the victims of the U.S. invasion of Panama in , officials said on Thursday. OEA/Ser.L/V/ll Doc. 16 rev.2 9 November Original: Spanish. REPORT ON THE SITUATION OF HUMAN RIGHTS IN PANAMA. TABLE OF CONTENTS. citizens in Panama. On December 20,, President Bush ordered about 12, U.S. mili- tary personnel to Panama (augmenting the 13, troops already sta-. On this day in , President George H.W. Bush ordered an invasion of Panama. Dubbed “Operation Just Cause," its prime purpose was to.