Funny... that is.
"JOSHUA, BOOK OF
"The doomsday book of Palestine," especially Josh 13-23. Authenticated by Scripture references to the events recorded in it (Ps. 78:53-65; 28:21; Hab. 3:11-13; Acts 7:45; Heb. 4:8; 11:30-32; James 2:25 ). Joshua after destroying the kings, so that Israel had rest from war in the open field, divided generally the land; but this is quite consistent with the after statements that years passed before the process of division was completed and the allotments finally settled. Joshua was directed to divide land not yet in Israel's actual possession (Josh 13:1-14:5). God designed that Israel should occupy the land by degrees, lest the beasts should multiply and the land be desolate (Ex 23:28-30); for instance, though the kings of Jerusalem and Gezer were slain, their people were not rooted out until long after. The slackness of Israel to extirpate the accursed Canaanites was also a cause of non-immediate possession (Josh 11:16,23; 12:7,10-12; compare Josh 15:63; 16:10; 17:1,16; 18:1,3; 19:51). Joshua is based on the Pentateuch (to which it is joined by the conjunction "now" or "and" at its beginning), "now" but distinct from it. Compare Josh 13:7 with Num 34:13; 13:17 with Num 32:37; 13:21-22 with Num 31:8; 13:14,33; 14:4, with Deut 18:1-2; Num 18:20; 21 with Num 35."
(from Fausset's Bible Dictionary, Electronic Database Copyright © 1998, 2003, 2006 by Biblesoft, Inc. All rights reserved.)