Titanosaurs were plant-eating giants that shook the earth roughly 95 million years ago in the Late Mesozoic period. They belonged to a group of dinosaurs called sauropods, which are known for their massive size.
"Fear nothing" refers to the dreadnought, the battleships of the early 1900's. These massive war machines were pretty much invincible and "feared nothing," in otherwords, they were in 'dread of nought.'