Possible Clues:

• Six-legged insects with a military name
• Colonial soldiers?
• Members of a tiny legion
• Insects that 'march'
• Those tiny and large columns that are blind to a private organisation associated with workers
• Raiding insects
• Fighting insects
• They're not looking where they're going in large columns to Mass at academy with old books from school
• Predatory insects
• Tiny troopers