PARIS—It was the dog that didn’t bark in the night, and its bite may be less impressive still. As a tale of hacking and political subversion unfolded in France on Friday and Saturday, it looked like a re-run of the American experience. But there are some critical differences.

In the last hours before midnight on Friday, just before a campaigning blackout imposed by French electoral law in anticipation of the crucial vote on Sunday, somebody dumped nine gigabytes of emails and documents supposedly purloined from the campaign of leading presidential candidate Emmanuel Macron.

It looked like, and almost certainly was, a last-minute bid to tip the scales in favor of the centrist Macron’s opponent, the nativist, populist Marine Le Pen, who has received more-than-tacit endorsements from Russian President Vladimir Putin, who received her at the Kremlin, and U.S. President Donald Trump, who has declared his appreciation of her as the “strongest” candidate.

Macron, by contrast, is favored by those who want a strong European Union, a strong NATO, and a France looking to the future rather than clinging to the fearful and fictional nostalgia promulgated by Le Pen.

As the news broke, suspicion focused on the same “Fancy Bear” Russian hackers who fiddled with the American presidential campaign last year. As The Daily Beast reported 10 days earlier, they have been working hard for the election of anti-immigrant, anti-Muslim, anti-European Union, anti-euro, anti-NATO, anti-American, Pro-Trump Le Pen.

Literally at the 11th hour, before the blackout would silence it, the Macron campaign issued a statement saying it had been hacked and many of the documents that were dumped on the American 4Chan site and re-posted by Wikileaks were fakes.

The mainstream French media carried the Macron campaign statement, but virtually nothing else. In addition to the normal proscription of campaign “propaganda” on election eve, the government issued a statement saying specifically that anyone disseminating the materials in this dump in France could be liable to prosecution, and calling on the media to shoulder their “responsibility” by steering clear of them.

Meanwhile, Wikileaks jumped on the document dump, but didn’t seem to be familiar with the material in it. Responding to the Macron statement that some of the items were bogus, Wikileaks tweeted, “We have not yet discovered fakes in #MacronLeaks & we are very skeptical that the Macron campaign is faster than us.”

Ah, but there’s the rub. As reported by The Daily Beast, part of the Macron campaign strategy against Fancy Bear (also known as Pawn Storm and Apt28) was to sign on to the phishing pages and plant bogus information.

“You can flood these [phishing] addresses with multiple passwords and log-ins, true ones, false ones, so the people behind them use up a lot of time trying to figure them out,” Mounir Mahjoubi, the head of Macron’s digital team, told The Daily Beast for its earlier article on this subject.

In the end, whoever made the dump may not have known what is real and what is false, which would explain in part the odd timing. After the disruptive revelations of the Democratic National Committee hacks in the United States, the public is conditioned to think that if there’s a document dump like this, it has to be incriminating. By putting it out just before the news blackout, when Macron cannot respond in detail, the dump becomes both the medium and the message.

On the alt-right Web, the publicity and the hashtag associated with the dump also provided a matrix for all sorts of wild misinformation that had nothing to do with the documents in question.

And the specific contents? So far, cybersleuths have turned up very little, and even Wikileaks started to seem suspicious, offering this tweet: “#MacronLeaks assessment update: several Office files have Cyrillic meta data. Unclear if by design, incompetence, or Slavic employee.”