Jeremiah 52:4
And it came to pass in the ninth year of his reign, in the tenth month, in the tenth day of the month, that Nebuchadrezzar king of Babylon came, he and all his army, against Jerusalem, and pitched against it, and built forts against it round about.
Jeremiah 52:4 fixes the opening of Nebuchadnezzar's final campaign and siege of Jerusalem to the tenth day of the tenth month in the ninth year of Zedekiah's reign. Nebuchadnezzar king of Babylon came in person with his whole army against Jerusalem, pitched his camp around the city, and built forts and siegeworks against it round about. The form Nebuchadrezzar is an alternate spelling of Nebuchadnezzar.
The siege came after Zedekiah revolted from Babylon and sought Egyptian help. When Egypt marched to Jerusalem's aid the Babylonians briefly lifted the siege, but they renewed it after that relief failed, and Jerusalem fell about a year and a half later. That siege belonged to the captivity of Judah that was completed under Zedekiah, when Jerusalem was destroyed and Zedekiah was taken prisoner.
The beginning of the siege in the tenth month was commemorated by a fast observed with mourning and fasting during the captivity. The siege fulfilled God's threat to destroy Jerusalem if the people would not listen and obey Him about keeping the Sabbath holy, though He had promised the city would stand forever if they bore no burdens on that day, showing His condescension and the sacredness of the Sabbath. The verse stands as a warning from Jerusalem's judgment to cities, places and people that forget and defy God. The warnings of judgment to proud, God-defying cities went unheeded until their doom, and the account including this verse is applied as a warning to modern cities.