“Us storming the castle,” Mr Caldwell wrote on the 7 January 2021 post, which also featured his wife Sharon Caldwell.
“Please share. Sharon was right with me! I am such an instigator! She was ready for it man! Don’t mind the tear gas,” he posted.
Mr Caldwell, a Navy veteran, is one of five people on trial for seditious conspiracy related to the insurrection on January 6, 2021.
He told a jury that messages he sent on social media and in texts about “assaulting” the Capitol were simply a “play by play” of events, and said he was a former high school sports radio commentator.
He also claimed that he does “a lot of creative writing” and claimed that some of his violent messages about delivering “heavy weapons” across the Potomac River were taken from screenplays he had written, or references from the Call of Duty video games.
Mr Caldwell has claimed he has never been a member of the Oath Keepers and has pleaded not guilty to all criminal charges. Federal prosecutors accept that neither he or his wife ever entered the US Capitol building.