Fortress Towers Were Separate From the Wall
Second was a citadel tower or fortress which was built apart from the wall and on higher ground than the rest of the city, and thus served to defend the city. The tower of Shechem referred to in the story of Abimelech was doubtless this sort of tower (Judges 9:46). [Manners And Customs of Bible Lands]
Tower in Naves Topical Bible
Ne 3:1; 12:39
Ne 3:1; 12:39; Jer 31:38; Zec 14:10
-In the walls of Jerusalem
2Ch 26:9; 32:5; Ne 12:38,39
-Of other cities
-In the desert
-For watchmen (sentinels)
2Ki 9:17; 18:8
Of divine protection
2Sa 22:3,51; Ps 18:2; 61:3; 144:2; Pr 18:10
Tower in Smiths Bible Dictionary
Watch-towers or fortified posts in frontier or exposed
situations are mentioned in Scripture, as the tower of Edar,
etc., Ge 35:21; Isa 21:5,8,11; Mic 4:8 etc.; the tower of
Lebanon. 2Sa 8:6 Besides these military structures, we read in
Scripture of towers built in vineyards as an almost necessary
appendage to them. 1Sa 5:2; Mt 22:33; Mr 12:1 Such towers are
still in use in Israel in vineyards, especially near Hebron,
and are used as lodges for the keepers of the vineyards.
Tower in the Bible Encyclopedia - ISBE
See FORTIFICATION, I, 5; CITY, II, 1.
Towers in Easton's Bible Dictionary
of Babel (Gen. 11:4), Edar (Gen. 35:21), Penuel (Judg. 8:9,
Shechem (9:46), David (Cant. 4:4), Lebanon (7:4),
29:10), Hananeel (Zech. 14:10), Siloam (Luke 13:4).
several towers in Jerusalem (2 Chr. 26:9; Ps. 48:12).
erected for various purposes, as watch-towers in
5:2; Matt. 21:33) and towers for defence.
Towers in Fausset's Bible Dictionary
Used as parts of city walls, or separate, as EDAR, LEBANON,
etc., to defend wells, flocks, or commerce (2 Chronicles
26:10; 2 Chronicles 27:4; Genesis 35:21; Micah 4:8). Also
attached to vineyards, as lodges for the keepers, wherein they
could watch against the depredations of man or beast (Isaiah
5:2; Matthew 21:33; Mark 12:1).
Towers Scripture - 2 Chronicles 14:7
Therefore he said unto Judah, Let us build these cities, and
make about [them] walls, and towers, gates, and bars, [while]
the land [is] yet before us; because we have sought the LORD
our God, we have sought [him], and he hath given us rest on
every side. So they built and prospered.
Towers Scripture - 2 Chronicles 26:10
Also he built towers in the desert, and digged many wells: for
he had much cattle, both in the low country, and in the
plains: husbandmen [also], and vine dressers in the mountains,
and in Carmel: for he loved husbandry.
Towers Scripture - 2 Chronicles 26:15
And he made in Jerusalem engines, invented by cunning men, to
be on the towers and upon the bulwarks, to shoot arrows and
great stones withal. And his name spread far abroad; for he
was marvellously helped, till he was strong.
Towers Scripture - 2 Chronicles 26:9
Moreover Uzziah built towers in Jerusalem at the corner gate,
and at the valley gate, and at the turning [of the wall], and
Towers Scripture - 2 Chronicles 27:4
Moreover he built cities in the mountains of Judah, and in the
forests he built castles and towers.
Towers Scripture - 2 Chronicles 32:5
Also he strengthened himself, and built up all the wall that
was broken, and raised [it] up to the towers, and another wall
without, and repaired Millo [in] the city of David, and made
darts and shields in abundance.
Towers Scripture - Ezekiel 27:11
The men of Arvad with thine army [were] upon thy walls round
about, and the Gammadims were in thy towers: they hanged their
shields upon thy walls round about; they have made thy beauty
Towers Scripture - Isaiah 23:13
Behold the land of the Chaldeans; this people was not, [till]
the Assyrian founded it for them that dwell in the wilderness:
they set up the towers thereof, they raised up the palaces
thereof; [and] he brought it to ruin.
Towers Scripture - Isaiah 30:25
And there shall be upon every high mountain, and upon every
high hill, rivers [and] streams of waters in the day of the
great slaughter, when the towers fall.
Towers Scripture - Isaiah 32:14
Because the palaces shall be forsaken; the multitude of the
city shall be left; the forts and towers shall be for dens for
ever, a joy of wild asses, a pasture of flocks;
Towers Were Part of the wall
The Oriental city has had two types of towers located in it.
First was the tower constructed as a part of the city wall. At this point the wall was built higher and served as a fortification. The approach of an enemy could be sighted from here, and weapons hurled down upon men who attempted to take the city. Almost every gate of any consequence would have a tower over it. Then towers were often built where the wall turned a corner. These were called "corner towers." King Uzziah made use of such towers: "And he made in Jerusalem engines, invented by skilful men, to be on the towers and upon the battlements
to shoot arrows and great stones withal" (II Chronicles 26: 15).
[Manners And Customs of Bible Lands]