'Watchtower' in the Bible

Arrange the table, watch in the watch-tower, Eat, drink, rise, ye heads, anoint the shield,

And he crieth -- a lion, 'On a watch-tower my lord, I am standing continually by day, And on my ward I am stationed whole nights.

Surely the palace hath been left, The multitude of the city forsaken, Fort and watch-tower hath been for dens unto the age, A joy of wild asses -- a pasture of herds;