Mahabharata Udyoga Parva Chapter 156:2

Mahabharata Udyoga Parva (Bhagwat Yana Parva) Chapter 156:2 And the elephants also were furnished with rows of bells and pearls and decked with diverse ornaments.and thousands, all those steeds were free from the habit of scratching the ground with their forehoofs. And they were all well-trained, and decked with ornaments of gold, and exceedingly obedient to their riders. And of foot-soldiers, there were hundreds of thousands of diverse mien, accoutred in armours of diverse kinds and armed also with weapons of diverse species, and decked with golden ornaments. And unto each car, were assigned ten elephants, and unto each elephant ten horses, and unto each horse ten foot-soldiers, as protectors. Again, a large body of troops was kept as a reserve for rallying the ranks that would be broken. And this reserve consisted of cars, unto each of which were attached fifty elephants; and unto each elephant were attached a hundred horses; and unto each horse were attached seven foot-soldiers. Five hundred cars, as many elephants (fifteen hundred horses, and two thousand five hundred foot-soldiers) constitute a Sena. Ten Senas constitute a Pritana; and ten Pritanas, a Vahini. In common parlance, however, the words Sena, Vahini, Pritana, Dhwajini, Chamu, Akshauhini, and Varuthini are used in the same sense. It was thus that the intelligent Kaurava arrayed his force. Between the two sides, the total number was eighteen Akshauhinis. Of this, the Pandava force consisted of seven Akshauhinis, while the Kaurava force consisted of ten Akshauhinis and one more. Five times fifty men constitute a Patti. Three Pattis make a Senamukha or Gulma. Three Gulmas make a Gana. In Duryodhana's army, there were thousands and hundred of such Ganas consisting of warriors capable of smiting (the foe) and longing for battle. And the mighty-armed king Duryodhana, selecting from among them brave and intelligent warriors, made them the leaders of his troops. And placing an Akshauhini of troops under each of those best of men, viz., Kripa, Drona, Salya, Jayadratha, the king of the Sindhus, Sudakshina the ruler of the Kamvojas, Kritavarman, Drona's son (Aswatthaman), Karna, Bhurisravas, Sakuni, the son of Suvala, and the mighty Vahlika, the king used to bring them daily before him and at all hours, and speak to them. And he repeatedly offered them worship before his very eyes. And thus appointed, all warriors, with all their followers, became desirous of doing what was most agreeable to the king.