Set your heart to her bulwark, Consider her high places, So that ye recount to a later generation Ps 48:13

The majority of the existing walls in Jerusalem are Ottoman in origin. Anything that comes from biblical times is found at the base of the walls, and today forms foundation layers on which modern adjustments and attachments have been made. A series of stones can be seen on the east of the temple mount relating to pre-Herodian times. The ancient walls of Jerusalem were destroyed a number of times: In AD70 significant damage was taken to the walls which was only partially reconstructed during the time of Aelia Capitolina.  Earthquakes destroyed the walls in the time of Empress Aelia Eudocia in 1033. Again during the fifth crusade 1219 and 1220 the devastation was so complete that the inhabitants described it as the coming of the day of judgment!  The Ottoman replacements built by Sultan Suleiman the Magnificent in 1535-1538 were  on essentially the same lines of the previous constructions. The walls of the crusaders can not be recognised. The notable crusader building works are preserved in the churches.

The commemoration of the breaching of the walls is celebrated in one of the days of fasting for the Jewish people. The day considered the 17th Tammuz [Shiv’ah Asar b’Tammuz] in AD70 under Titus and Vespasian and on the 9th Tammuz 586BC the walls were breached under the battering rams of Nebuchadnezzar, Jer 39.2, 52.6–7. A commemoration of this is observed within a  fast on the fourth month mentioned in Zech 8:19 and is observed 40 days after Shavuot. [feast of weeks] and continues for 3 weeks.

To see her walls is see the people of faith that make up the city. The walls of Jerusalem are always before the face of Yahweh Isa 49:16. A man who rules his spirit is greater than he that takes a city. Prov 16;32 His spirit is the walls of his life, and when influenced by deity it becomes  a spirit of justice to him who sits in judgment, a source of strength to those who turn back the battle at the gate. Isa 28:6 The walls of Jerusalem are a component of the faith in the operation of God, and a feature of those “born in her” Ps 87:5; Gal 4:26

But breaches in walls are made by the failure of men. When there was a breach in the wall Ezekiel was to search for a man to close the gaps Ezek 13. But the false prophets were proclaiming peace. They claimed they were the people and “temple” of God and God could not do without them. But this was merely a whitewash, or daubed mortar that covered the corruption of their hearts underneath. To build real houses needs real foundations Ezek 13:11; Matthew 7:15-29 The man to stand in the gaps was Christ, portrayed in typical fashion by Nehemiah, Neh 2:10f.

The duties of guarding the walls, [a feature of the priesthood] are given to men who are not only faithful, but fear Deity [above other fears] Neh 7:2 God loves this spirit more than all the tabernacles of Jacob Ps 87:2.