Are the type of person to reply "who" to a Twitter post announcing a game against a non-league side then you're a knobhead. The amount of grief Wednesday get on here for being "massive" you'd think people might be a bit more self-aware.
I had to google them as I've not heard of Horsham before. Wonder if they've ever played a competitive game against a league side?
Founded 1871. Sounds like they were more of a military based club back in the day, with their trophies.
Given what you found. Re the link. As best fa cup run. They drew with Swansea 2nd rd 2007/8 (Then a 3rd tier club who finished up champions that season ) at home. 1-1. But lost the replay 6-2. Nowts ever easy.