Andrew Wilson Orlando, who testified as a prosecution witness, told court that he had presented himself to Besigye and his associates as a wealthy foreign businessman with access to large amounts of money, weapons and international contacts. He later revealed that the business and financial backing he claimed to have were fictitious.
According to his testimony, the operation was conducted while he was secretly cooperating with Ugandan security agencies. He said the aim was to gather information about alleged plans involving weapons, military training and attempts to destabilise the government.
Among the most serious claims made by Wilson was an alleged discussion about assassinating President Yoweri Museveni. The witness told court that the conversation arose while discussing how an alleged opposition group could overthrow the government.
Wilson claimed that he suggested killing Museveni as part of such an operation. He further alleged that the participants discussed whether responsibility for an attack should be claimed or attributed to another armed group.
These claims have not been established as facts, and Besigye and his co-accused have denied the allegations against them.
Secret recordings
Wilson's testimony also focused heavily on recordings that he said he secretly obtained during meetings.
He told court that he used a modified power bank containing a hidden camera to record some of his interactions with Besigye and other individuals. He said some meetings took place in Geneva and that the recorded material was later transferred to storage devices and handed over to investigators.
The recordings could become important to the case because they may provide evidence that can either support or challenge Wilson's account.
However, questions about how the recordings were obtained, preserved and presented could become important during the defence's examination of the evidence.
Alleged weapons and training
Wilson also described alleged plans involving military equipment and training.
He claimed that he promised to help arrange weapons and training for recruits. Among the items allegedly discussed were grenades, drones and surface-to-air missiles.
He said a training operation involving Ugandans was discussed in Kisumu, Kenya. According to his testimony, he offered to facilitate training for dozens of people and used fictitious promises of weapons and financial support to maintain his cover.
The prosecution has linked these allegations to its wider case that the accused were involved in efforts to overthrow the government through unlawful means.
The defence is expected to challenge the interpretation of these interactions and the extent to which Wilson's undercover activities influenced the conversations.
Questions over the witness
One of the biggest issues surrounding Wilson's evidence is that he was not simply an observer.
By his own account, he deliberately created a false identity, promised money that did not exist and claimed to have access to weapons and foreign financiers.
That raises an important question for the court: did he uncover an already existing plan, or did his undercover operation encourage conversations and activities that might otherwise not have happened?
The answer could have a major impact on how his evidence is assessed.
Besigye's supporters have also questioned Wilson's credibility and motives. His wife, Winnie Byanyima, has previously alleged that Wilson was paid to conduct an operation against her husband. That claim remains an allegation and has not been independently established.
The court's task
The allegations presented by Wilson are serious, but testimony alone does not determine guilt.
The court will need to examine the recordings, documents, communications and other evidence presented by the prosecution. It will also have to consider the defence's challenges to Wilson's credibility and the circumstances under which the alleged evidence was obtained.
The proceedings therefore raise questions that go beyond the dramatic allegations themselves.
The central issue will be whether the prosecution can prove that Besigye and his co-accused knowingly participated in a genuine criminal conspiracy, rather than merely engaging with an undercover operative who had constructed a false world around them.
For now, the alleged assassination plan, weapons discussions and military activities remain allegations before the court.
As the case continues, the credibility of Andrew Wilson Orlando and the evidence supporting his testimony are likely to remain at the centre of the legal battle.
