deputy Mick Wallace told Ennis District Court that he scaled the fence at Shannon airport last July to 'promote peace not war'.
'I'm admitting that I got over the fence to do what I thought was right. I felt as a legislator, I had an obligation to see that Ireland was not breaking international law,' he told the court.
The deputy said he wanted to search a US military plane after then-Minister Alan Shatter challenged him to go and get the evidence of arms on the planes.
The deputy said that the government's story that there was no concrete evidence of arms or munitions on US planes landing at Shannon was something you 'wouldn't read in the Beano'.
'Under no circumstances were we going to be allowed in and search the planes and the only chance we would have of searching the planes was to get over the fence illegally and search the planes ourselves.'
Deputy Wallace and Deputy Clare Daly were both appearing concerning their alleged illegal entrance into a restricted area of Shannon airport.
He said there no transparency or accountability over what is happening at Shannon and that Ireland allowed the US military to use Shannon airport 'to carry out carnage on a world wide level'.
In her evidence, Deputy Clare Daly said that she had no choice but to highlight the use of Shannon by the US military when she scaled a fence at the airport. She admitted that she did go over the fence and was airside without permission. The case was adjourned the case to April 15.