John Gill's Exposition of the Whole Bible
2 Samuel 2:30
And Joab returned from following Abner,.... It being in his commission from David to shed as little blood as he could:
and when he had gathered all the people together; who had been pursuing the Israelites, some one way and some another:
there lacked of David's servants nineteen men, and Asahel; who is particularly mentioned, because a very honourable man, valiant and courageous, a relation of David, and brother of Joab the general, and the loss of him was greater than all the rest. This has made some think that the twelve men of the servants of David were not killed in the duel, or otherwise there must be but seven slain in the battle; though that is not more strange than that in the battle with Midian not one should be slain, and, yet a terrible slaughter was made of the Midianites, Numbers 31:1. So in a sharp battle between the Spartans and Arcadians, ten thousand of the latter were slain, and not one of the former q. Stilicho killed more than an hundred thousand of the army of Rhadagaisus, king of the Goths, without losing one of his own men, no, not so much as one wounded, as Austin affirms r. At the battle of Issus the Persians lost an hundred ten thousand men, and Alexander not two hundred s. Julius Caesar killed in the three camps of Juba, Scipio, and Labienus, ten thousand men, with the loss of fifty men only t. After these instances, not only the case here, but that between the Israelites and Midianites, cannot be thought incredible, for the sake of which the above are produced. This account, according to Josephus u, was taken the day following.
q Diodor. Sic. l. 15. p. 383. r De civilate Dei, l. 5. c. 23. s Curtius, l. 3. c. 11. t Hirtius de Bello African. c. 86. u Antiqu. l. 7. c. 1. sect. 3.