Also, he re-settled significant numbers of foreign people in Samaria. (This is mentioned in Ezra 4:2)
I presume this action would have happened about the same time as his Egyptian campaign, but an accurate date would be appreciated.They approached Zerubbabel and the heads of fathers' houses and said to them, “Let us build with you, for we worship your God as you do, and we have been sacrificing to him ever since the days of Esarhaddon king of Assyria who brought us here.”