2 Chronicles 35:20

After all this. This was 13 years after Josiah’s Passover in his 18th year (v. 19), since he reigned 31 years (ch. 34:1). The history of Judah for this 13-year period is almost a complete blank. Some idea of conditions during this period may be gained from such contemporary prophetic books as Jeremiah, Habakkuk, and Zephaniah.

When Josiah had prepared the temple. This clause is explanatory of the preceding phrase “after all this,” that is, the events to be narrated happened after the time that Josiah had prepared the Temple, not at the time of the preparation, as the English translation may be interpreted.

Against Charchemish. This section dealing with Josiah’s death in battle against Necho (vs. 20-27) is parallel to 2 Kings 23:29, 30. The Chronicles account contains more details than the account in Kings. Necho’s object was to aid the Assyrians against the Babylonian forces that had moved west, threatening both Syria and Palestine, for ultimately those forces would become a menace to Egypt. For further details on the situation at that time see on 2 Kings 23:29.