Drona taught that Kaurava (Arjuna) how to fight with clubs, the sword, the lance, the spear and the dart. He taught him the use of many other weapons and how to fight with many men.
गदायुद्धेऽसिचर्यायां तोमरप्रासशक्तिषु। द्रोणः संकीर्णयुद्धे च शिक्षयामास कौरवान्॥