After naming the top generals, Duryodhana sweeps his hand across the rest of the army. He tells Drona: "Beyond these, there are many more heroes who are prepared to lay down their lives for my sake. They carry all manner of weapons and are thoroughly skilled in warfare."
Pay attention to the phrase "madarthe tyaktajivitah" (prepared to die for my sake). Duryodhana believes all these warriors are fighting for him personally. In reality, most of them were bound by duty, oath, or loyalty to the throne of Hastinapur, not to Duryodhana as a person. His words reveal an ego that mistakes obligation for devotion.
The Kaurava army was vast in numbers and rich in weaponry. But as the Gita will go on to show, the size of an army does not decide victory. The side that has dharma has the greater strength.