“Fuego” is also the Mexican word for “help.” As in what you shout if someone is attacking you. Whether it applies to other dialects, I don’t know.
All right then, so much for the Second Age. Let’s try the Third Age. From your linked site, at Helm’s deep Aragorn gives the order “Tangado a chadad!” to the Elvish archers which is translated as “Prepare to fire!”
LL, no small Tolkien geek himself.