The three men were accused of conspiring to commit a crime and concealing treason. They dispute the accusations.
They have been accused of plotting and concealing information about the attempted overthrow of President Adama Barrow in October and December 2022 in Banjul, the nation’s capital, and other locations.
They were also accused of failing to alert the appropriate authorities after learning of a plot to remove President Barrow from office from the alleged ringleader.
Last week, a national security adviser said civilians were involved with their role being to finance the alleged foiled coup.
In December, the government said it had thwarted an attempt to stage a coup and arrested some soldiers.
This is the first time the accused people have been taken to court. The military personnel will be taken to a court martial.