This was a politic course of the Philistines, which also other nations have used. So the Chaldeans took away their smiths, 2 Kings 24:14 Jeremiah 24:1, Jeremiah 30:2; and Porsenna obliged the Romans by covenant, that they should use no iron but in the tillage of their lands.
Related Commentaries of 1 Samuel 13:19
1 Samuel 13:19
19 Now there was no smith found throughout all the land of Israel: for the Philistines said, Lest the Hebrews make them swords or spears: