The Battle of Grand Gulf was fought on April 29, 1863, during th: English has also borrowed many words directly from Latin, the ancestor of the Romance languages, during all stages of its development.[227][225] Many of these words had earlier been borrowed into Latin from Greek. Latin or Greek are still highly productive sources of stems used to form vocabulary of subjects learned in higher education such as the sciences, philosophy, and mathematics.[238] English continues to gain new loanwords and calques ("loan translations") from languages all over the world, and words from languages other than the ancestral Anglo-Saxon language make up about 60% of the vocabulary of English.[239]