Thomas F. Harney

[SSlater]

RJN. I agree with your priorities. The news of Harney's arrest was overlooked by everybody, at that time, because no one knew about about his mission. The Battle and some arrests were put into the Newspapers the next day (April 11+/-), but nothing on Harney. He was put in Old Capitol April 12 +/-. If his arrest was announced ,in some way, I can't find a record of it. Note how close these dates are to the 14th.
It is possible, that the "Washington Action Group", who were holding the explosives, were the first to notice that Harney is VERY LATE, and checked with their sources. (I don't see Booth in the Group.) and that got the word around about the failure.
Based on this, and knowing that Booth had already called his team to Washington, Booth was ready to act. This failure may have been the trigger that made Booth MOVE.
I'd like to change your last sentence, from "Some Lincoln Books", to "Most Lincoln Books", don't mention Harney. I doubt that there has ever been a Group, like this Symposium, who spent as much time really digging deep into the Assassination, as they are. As said elsewhere, no on knew about Harney's mission, until 1907, and even then there were no details. Even now, I can't find out exactly WHO HARNEY WAS. (But I'm searching. There is NOTHING on him, anywhere.)