This is the tenth month of the Hebrew calendar. The tenth day is near the end of December on Western calendars. This is during the cold season when there may be rain and snow. (See: [[rc://en/ta/man/translate/translate-ordinal]] and [[rc://en/ta/man/translate/translate-hebrewmonths]])
The name "Jerusalem" is a metonym for the people who lived in it. AT: "came with his whole army to fight against the people of Jerusalem" or "came with his whole army to conquer Jerusalem" (See: [[rc://en/ta/man/translate/figs-metonymy]])