There were many conspiracies against Diệm in 1963, many by different cliques of military officers independent from one another. According to the historian
Ellen Hammer, there were "perhaps as many as six and possibly more" different plots, and these spanned the gamut of society to include civilian politicians, union leaders, and university students. As South Vietnam was a police state, Tuyến was a powerful figure and had many contacts. Another person in this group was Colonel
Phạm Ngọc Thảo, an undetected communist agent who was deliberately fomenting infighting among the officers and mismanaging the
Strategic Hamlet Program in order to destabilise the Saigon government. Tuyến's group had many officers who were members of the opposition
Việt Nam Quốc Dân Đảng and
Đại Việt Quốc Dân Đảng, These officers included commanders of
airborne,
marine and tank units from the
5th Division, When Tuyến's machinations were uncovered, he was exiled by Nhu. Mậu and Thảo took over but their initial coup plans for 15 July were shelved when American
CIA officer
Lucien Conein instructed Thảo's superior, General
Trần Thiện Khiêm, the head of the ARVN, to stop the coup on the grounds that it was premature. Thảo and Mậu's group resumed plotting, intending to move on 24 October and they recruited a total of 3000 men. The younger officers' plot was integrated into the generals' larger group, and because Khiêm and Mậu were involved with both groups. After the coup was completed, the media learned that the conspiracy organised by Tuyến and Thảo had been more advanced than that of the generals' before the latter were integrated into the main plot. General
Trần Văn Đôn threatened to have the younger officers arrested but Mậu intervened to protect them.
Plotting by the generals Following the Xá Lợi Pagoda raids, the senior generals started their own plot in earnest, having only had vague plans prior to this. General Đôn, nominally a high-ranking general, but in a position without command of troops since the palace distrusted him, was sought out by Mậu, who wanted to collaborate. Mậu later accompanied the ranking general in the plot,
Dương Văn Minh, on recruitment campaigns. Despite his high rank, Minh was out of favour and served as the Presidential Military Advisor, a meaningless desk job where he had no subordinates in the field and no access to soldiers. Mậu helped Minh to secure the cooperation of General
Nguyễn Khánh, According to Thiệu, Mậu and Minh had promised to establish a more strongly anti-communist government and to keep Diệm as a figurehead president.
Recruitment of Đính The generals knew that without the cooperation of General Đính, a coup would be difficult as his III Corps forces oversaw the region surrounding the capital. Regarded by his peers as ambitious, vain and impulsive, Đính was a favorite of the Ngô family, and headed the military wing of the Cần Lao Party. Đính converted to Catholicism as Diệm trusted his co-religionists and promoted officers based on loyalty and not competence. Đính was known mainly for his drunken presence in Saigon's nightclubs, and the CIA labeled him a "basic opportunist". Đính privately claimed responsibility for the pagoda attacks, During this period, Đính claimed he was "a great national hero". His ego had been played upon by the Ngô brothers, who reiterated this point and paid him a large cash bonus after the pagoda raids. In the heady times after the attacks, Đính told his American advisors that "he was without doubt the greatest general officer in the ARVN, the saviour of Saigon ... and soon he would be the top military man in the country". In a press conference soon after, Đính claimed to have saved South Vietnam from "foreign adventurers", a euphemism for the United States. Đính returned to the officers' mess at the
Joint General Staff (JGS) headquarters The other generals told him that the people were dissatisfied with Diệm's cabinet and that Vietnam needed dynamic young officers in politics, and that their presence would reverse the declining morale in the ARVN. Nhu then made a plan to outwit the generals with a counter-plot. The generals heard of this, and decided that they had to counteract him. Exhorting them to join the coup on the grounds that Diệm's regime was unable to keep the military going forward, he stated that all the generals except Cao were in the plot, while Đính was going to do so. Nhu opposed this and stated that he wanted Có alive to catch the plotters, and tried to use Đính to achieve this. Despite their distrust of Đính, the Ngô brothers told them this was not the case and that they would promote him. both of whom took their orders directly from the palace instead of the ARVN command, to plan a fake coup against the Ngô family. One of Nhu's objectives was to trick dissidents into joining the false uprising so that they could be identified and eliminated. Another objective of the public relations stunt was to give the public a false impression of the strength of the Ngô regime. During the orchestrated chaos of the first coup, the disguised loyalists would riot and in the ensuing mayhem, kill the leading coup plotters, such as Generals Dương Văn Minh, Trần Văn Đôn, Lê Văn Kim and junior officers that were helping them. The loyalists and some of Nhu's underworld connections were also to kill some figures who were assisting the conspirators, such as the titular but relatively powerless Vice President
Nguyễn Ngọc Thơ, CIA agent Lucien Conein, who was on assignment in South Vietnam as a military adviser, and Lodge. Tung would then announce the formation of a "revolutionary government" consisting of opposition activists who had not consented to being named in the government, while Diệm and Nhu would pretend to be on the run and move to
Vũng Tàu. A fake "counter-coup" was to follow, whereby Tung's men, having left Saigon on the pretext of fighting the
Viet Cong (VC), as well as Đính's forces, would triumphantly re-enter Saigon to reaffirm the Diệm regime. Nhu would then round up opposition figures. Đính, now a double agent, was put in charge of the fake coup and was allowed the additional control of the 7th Division, which was previously assigned to Diệm loyalist General
Huỳnh Văn Cao, who was in charge of the
IV Corps in the
Mekong Delta. The reassignment of the 7th Division to Đính gave his III Corps complete encirclement of Saigon. The encirclement would prevent Cao from storming the capital to save Diệm as he had done during the 1960 coup attempt. This arrangement was supposed to make Đính's task of serving the regime easier, but it was exploited to bring down the Ngô family. opining, "If we move reserves into the city, the Americans will be angry. They'll complain that we're not fighting the war. So we must camouflage our plan by sending the special forces out to the country. That will deceive them." Tung and Nhu agreed to send all four Saigon-based special forces companies out of Saigon on 29 October. Another of Diệm's brothers,
Ngô Đình Cẩn, began to suspect Mậu and told the palace, which told army chief General Khiêm to have Mậu arrested. However, Khiêm, who was also part of the plot, deliberately procrastinated, and Mậu remained free. In the meantime, it was too late for the brothers to bring their loyalists back into the capital. Not trusting Có, Diệm put Colonel
Lâm Văn Phát in command of the 7th Division on 31 October. According to tradition, Phát had to pay the Corps' commander a courtesy visit before assuming control of the division. Đính refused to see Phát and told him to come back on Friday at 14:00, by which time the coup would have been in progress. In the meantime, Đính had Đôn sign a counter-order transferring command of the 7th Division to Có. ==Rebel troop movements in and around Saigon==