deleted map

so this is not a map making question, but I maybe someone knows. I wanted to play the 2fort invasion map but I deleted it (long story), thinking I would just re download it when I went to play it. But when I try to play it, instead of downloading the map, it just says I don't have the map. is there anyway i can get the map back without reinstalling the game?

 

please correct me if i am wrong but i think you can go to steam>library>Team Fortress 2>properties>files (?)>verify integrity of game files