As Americans relaxed over a long Fourth of July weekend, the pro-Trump meme factories were gearing up for war.

These online communities, which churn out lo-fi, shareable images and videos meant to amuse and energize President Trump’s social media supporters while provoking his enemies, were spurred to action by what, in their world, qualified as a series of seismic events.

The first shock came on Sunday morning, when President Trump tweeted a video that depicted him in a professional wrestling arena attacking a man with a CNN logo superimposed on his head. The meme, or one very similar to it, had been created by a user on Reddit, the popular internet forum, and posted days earlier on /r/The_Donald, an active pro-Trump forum there, before making its way to the wider internet and, finally, to the 33.3 million Twitter followers of the leader of the free world.

In the world of meme creators, where getting a presidential tweet is akin to having your artwork hung on the wall of the Smithsonian, President Trump’s post was cause for celebration. “Wow!! I never expected my meme to be retweeted by the God Emperor himself!!!” wrote the creator, a frequent poster on Reddit whose user name combines a vulgarity with the Star Wars character Han Solo.