Arjuna said: The demons, concealed from view, began fighting by the help of illusion. I also by the power of invisible weapons (i.e. weapons operating on unseen objects) fought with them,
अर्जुन उवाच अदृश्यमानास्ते दैत्या योधयन्ति स्म मायया। अदृश्येनास्त्रवीर्येण तानप्यहमयोधयम्॥