The phrase "horror struck" is correct and usable in written English.
You can use it when you want to emphasize someone's shock, surprise, or fear upon seeing something. For example: The crowd stood in awe, horror struck, as they saw the tornado approach.
She was horror struck – about as horror struck as that producer in Cannes eight years ago.
So when horror struck, it was with a spectacle never seen before in this country.
But on 7 January this year, the day the controversial novel was published, horror struck France.
They said the singers had been briefed to perform classics such as Nessun Dorma but horror struck when they broke into an impromptu Abba medley (which I think sounds amazing).
But two days after a German-Iranian teenager killed nine people in a shooting rampage in the Bavarian capital, horror struck Hanno's town of 40,000 when a 27-year-old Syrian refugee blew himself up in front of a music festival on Sunday night.
"Horror struck Sweden at its heart today," Hidalgo tweeted.
For several years, the romantic comedy has largely been a place of dread, disgust and horror, striking fear in the hearts of boyfriends, husbands, and people with taste.
"When horror strikes, the heart is always its first target," the reader is told by the surgeon, Dr. Amin Jaafari, who delivers most of the book's frequent aphorisms.
His dreams will be troubled with horrid shapes as the horror strikes of ghosts of drunken men file past him from the crowded lavabos of memory.
When horror strikes, his voice exacerbates, rather than relieves, our aching.
"The whole of France must mobilise against the horror that struck our country yesterday.
