The word "hand" here is a metonym for the power or control that the enemies will exercise using their hands. Alternate translation: "I will allow their enemies to have complete control over them" (See: [[rc://en/ta/man/jit/figs-metonymy]])
Here the word "hands" represents control. Alternate translation: "to be conquered by their enemies" or "over to the control of their enemies" (See: [[rc://en/ta/man/jit/figs-metonymy]])